Chapter 28

Dex`tro*ro"ta*to*ry (?), a. [Dextro- + rotatory.] (Chem. & Opt.) Turning, or causing to turn, toward the right hand; esp., turning the plane of polarization of luminous rays toward the right hand; as, dextrorotatory crystals, sugars, etc. Cf. Levorotatory.

{ Dex*tror"sal (?), Dex"trorse` (?), } a. [L. dextrorsum, contr. fr. dextrovorsum, dextroversum, toward the right side; dexter right + versus, vorsus, p. p. of vertere, vortere, to turn.] Turning from the left to the right, in the ascending line, as in the spiral inclination of the stem of the common morning-glory.

At present scientists predicate dextrorse or sinistrorse quality of the plant regarded objectively; formerly the plant was regarded subjectively, and what is now called dextrorse was then considered sinistrorse.

Dex"trose` (dks"trs`), n. [See Dexter.] (Chem.) A sirupy, or white crystalline, variety of sugar, C6H12O6 (so called from turning the plane of polarization to the right), occurring in many ripe fruits. Dextrose and levulose are obtained by the inversion of cane sugar or sucrose, and hence called invert sugar. Dextrose is chiefly obtained by the action of heat and acids on starch, and hence called also starch sugar. It is also formed from starchy food by the action of the amylolytic ferments of saliva and pancreatic juice.

The solid products are known to the trade as grape sugar; the sirupy products as glucose, or mixing sirup. These are harmless, but are only about half as sweet as cane sugar or sucrose.

Dex"trous (?), a., Dex"trous*ly, adv., Dex"trous*ness, n. Same as Dexterous, Dexterously, etc.

Dey (?), n. [See Dairy.] A servant who has charge of the dairy; a dairymaid. [Obs.] Chaucer.

Dey (?), n.; pl. Deys (#). [Turk. di, orig., a maternal uncle, then a friendly title formerly given to middle-aged or old people, especially among the Janizaries; and hence, in Algiers, consecrated at length to the commanding officer of that corps, who frequently became afterward pasha or regent of that province; hence the European misnomer of dey, as applied to the latter: cf. F. dey.] The governor of Algiers; -- so called before the French conquest in 1830.

Deye (?), v. i. To die. [Obs.] Chaucer.

{ Deyn"te, Deyn"tee (?) }, n. & a. See Dainty. [Obs.] Chaucer.

De*zinc`i*fi*ca"tion (?), n. The act or process of freeing from zinc; also, the condition resulting from the removal of zinc.

De*zinc"i*fy (?), v. t. [Pref. de- + zinc + -fy.] To deprive of, or free from, zinc.

||Dhole (?), n. (Zoöl.) A fierce, wild dog (Canis Dukhunensis), found in the mountains of India. It is remarkable for its propensity to hunt the tiger and other wild animals in packs.

||Dho"ny (?), n. A Ceylonese boat. See Doni.

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||Dhoor"ra, ||Dhour"ra, or Dhur"ra (&?;), n. Indian millet. See Durra.

||Dhow (?), n. [Ar. do?] A coasting vessel of Arabia, East Africa, and the Indian Ocean. It has generally but one mast and a lateen sail. [Also written dow.]

Di- (?). [Gr. di`s- twice; akin to &?; two, L. bis twice. See Two, and cf. Bi-, Dia-. The L. pref. dis- sometimes assumes the form di-. See Dis-.] A prefix, signifying twofold, double, twice; (Chem.) denoting two atoms, radicals, groups, or equivalents, as the case may be. See Bi-, 2.

{ Di"a- (?), Di- }. [Gr. dia` through; orig., dividing into two parts; akin to &?; two. See Two, and cf. 1st Di-.] A prefix denoting through; also, between, apart, asunder, across. Before a vowel dia-becomes di-; as, diactinic; dielectric, etc.

Di"a*base (?), n. [F. diabase, fr. Gr. &?; a crossing or passing over, fr. &?;; &?; + &?; to go; -- so called by Brongniart, because it passes over to diorite.] (Min.) A basic, dark-colored, holocrystalline, igneous rock, consisting essentially of a triclinic feldspar and pyroxene with magnetic iron; -- often limited to rocks pretertiary in age. It includes part of what was early called greenstone.

Di*ab`a*te"ri*al (?), a. [Gr. &?; &?; (sc. &?;) offerings before crossing the border, fr. &?; to pass over. See Diabase.] Passing over the borders. [R.] Mitford.

Di`a*be"tes (?), n. [NL., from Gr. &?;, fr. &?; to pass or cross over. See Diabase.] (Med.) A disease which is attended with a persistent, excessive discharge of urine. Most frequently the urine is not only increased in quantity, but contains saccharine matter, in which case the disease is generally fatal.

||Diabetes mellitus [NL., sweet diabetes], that form of diabetes in which the urine contains saccharine matter. -- ||Diabetes insipidus [NL., lit., diabetes], the form of diabetes in which the urine contains no abnormal constituent.

{ Di`a*bet"ic (?), Di`a*bet"ic*al (?), } a. Pertaining to diabetes; as, diabetic or diabetical treatment. Quian.

Diabetic sugar. (Chem.) Same as Dextrose.

{ ||Dia`ble*rie" (?), Di*ab"le*y (?), } n. [F. diablerie, fr. diable devil, L. diabolus. See Devil.] Devilry; sorcery or incantation; a diabolical deed; mischief.

{ Di`a*bol"ic (?), Di`a*bol"ic*al (?), } a. [L. diabolicus, Gr. &?; devilish, slanderous: cf. F. diabolique. See Devil.] Pertaining to the devil; resembling, or appropriate, or appropriate to, the devil; devilish; infernal; impious; atrocious; nefarious; outrageously wicked; as, a diabolic or diabolical temper or act. "Diabolic power." Milton. "The diabolical institution." Motley. -- Di`a*bol"ic*al*ly, adv. -- Di`a*bol"ic*al*ness, n.

Di`a*bol"i*fy (?), v. t. [L. diabolus devil + -fy.] To ascribed diabolical qualities to; to change into, or to represent as, a devil. [R.] Farindon.

Di*ab"o*lism (?), n. 1. Character, action, or principles appropriate to the devil.

2. Possession by the devil. Bp. Warburton.

Di*ab"o*lize (?), v. t. To render diabolical. [R.]

Di`a*ca*thol"i*con (?), n. [Pref. dia- + catholicon.] (Med.) A universal remedy; -- name formerly to a purgative electuary.

Di`a*caus"tic (?), a. [Pref. dia- + caustic.] (Opt.) Pertaining to, or possessing the properties of, a species of caustic curves formed by refraction. See Caustic surface, under Caustic.

Di`a*caus"tic, n. 1. (Med.) That which burns by refraction, as a double convex lens, or the sun's rays concentrated by such a lens, sometimes used as a cautery.

2. (Math.) A curved formed by the consecutive intersections of rays of light refracted through a lens.

{ ||Di*ach"y*lon (?), ||Di*ach"y*lum (?), } n. [NL. diachylum, fr. Gr. &?; very juicy; dia` thoroughly + &?; juice.] (Med. & Chem.) A plaster originally composed of the juices of several plants (whence its name), but now made of an oxide of lead and oil, and consisting essentially of glycerin mixed with lead salts of the fat acids.

Di*ac"id (?), a. [Pref. di- + acid.] (Chem.) Divalent; -- said of a base or radical as capable of saturating two acid monad radicals or a dibasic acid. Cf. Dibasic, a., and Biacid.

||Di`a*co"di*um (?), n. [L., from Gr. &?; &?; from poppy heads; dia` through, from + &?; head, a poppy head.] A sirup made of poppies.

Di*ac"o*nal (?), a. [LL. diaconalis: cf. F. diaconal. Cf. Deacon.] Of or pertaining to a deacon.

Di*ac"o*nate (?), n. [L. diaconatus: cf. F. diaconat.] The office of a deacon; deaconship; also, a body or board of deacons.

Di*ac"o*nate, a. Governed by deacons. "Diaconate church." T. Goodwin.

||Di*ac"o*pe (?), n. [L., fr. Gr. &?; a cutting in two; dia` through + &?;.] (Gram.) Tmesis.

Di`a*cous"tic (?), a. [Pref. di- + acoustic.] Pertaining to the science or doctrine of refracted sounds.

Di`a*cous"tics (?), n. [Cf. F. diacoustique.] That branch of natural philosophy which treats of the properties of sound as affected by passing through different mediums; -- called also diaphonics. See the Note under Acoustics.

{ Di`a*crit"ic (?), Di`a*crit"ic*al (?), } a. [Gr. &?;, fr. &?; to separate, distinguish; dia` through + &?; to separate. See Critic.] That separates or distinguishes; -- applied to points or marks used to distinguish letters of similar form, or different sounds of the same letter, as, , , ä, , , etc. "Diacritical points." Sir W. Jones.

A glance at this typography will reveal great difficulties, which diacritical marks necessarily throw in the way of both printer and writer.

A. J. Ellis.

Di`ac*tin"ic (?), a. [Pref. di- + actinic.] (Physics) Capable of transmitting the chemical or actinic rays of light; as, diactinic media.

||Di`a*del"phi*a (?), n. pl. [NL., fr. Gr. di- = di`s- twice + &?; brother.] (Bot.) A Linnæan class of plants whose stamens are united into two bodies or bundles by their filaments.

{ Di`a*del"phi*an (?), Di`a*del"phous (?), } a. [Cf. F. diadelphe.] (Bot.) Of or pertaining to the class Diadelphia; having the stamens united into two bodies by their filaments (said of a plant or flower); grouped into two bundles or sets by coalescence of the filaments (said of stamens).

Di"a*dem (?), n. [F. diadème, L. diadema, fr. Gr. &?;, fr. &?; to bind round; dia` through, across + &?; to bind; cf. Skr. d to bind.] 1. Originally, an ornamental head band or fillet, worn by Eastern monarchs as a badge of royalty; hence (later), also, a crown, in general. "The regal diadem." Milton.

2. Regal power; sovereignty; empire; -- considered as symbolized by the crown.

3. (Her.) An arch rising from the rim of a crown (rarely also of a coronet), and uniting with others over its center.

Diadem lemur. (Zoöl.) See Indri. -- Diadem spider (Zoöl.), the garden spider.

Di"a*dem, v. t. To adorn with a diadem; to crown.

Not so, when diadem'd with rays divine.

Pope.

To terminate the evil, To diadem the right.

R. H. Neale.

Di"a*drom (?), n. [Gr. &?; a running through; dia` through + &?;, used as inf. aor. of &?; to run.] A complete course or vibration; time of vibration, as of a pendulum. [Obs.] Locke.

{ Di*ær"e*sis, Di*er"e*sis } (?; 277), n.; pl. Diæreses or Diereses (#). [L. diaeresis, Gr. &?;, fr. &?; to divide; dia` through, asunder + &?; to take. See Heresy.] 1. (Gram.) The separation or resolution of one syllable into two; -- the opposite of synæresis.

2. A mark consisting of two dots [], placed over the second of two adjacent vowels, to denote that they are to be pronounced as distinct letters; as, coöperate, aërial.

Di`æ*ret"ic (?), a. [Gr. &?; dividing.] (Med.) Caustic. [Obs.]

Di`a*ge`o*trop"ic (?), a. [Gr. dia` through, at variance + &?; earth + &?; turning.] (Bot.) Relating to, or exhibiting, diageotropism.

Di`a*ge*ot"ro*pism (?), n. (Bot.) The tendency of organs (as roots) of plants to assume a position oblique or transverse to a direction towards the center of the earth.

Di"a*glyph (?), n. [Gr. &?; to engrave; dia` through + &?; to carve.] An intaglio. Mollett.

{ Di`a*glyph"ic (?), Di`a*glyph"tic (?), } a. Represented or formed by depressions in the general surface; as, diaglyphic sculpture or engraving; -- opposed to anaglyphic.

Di`ag*nose" (?), v. t. & i. To ascertain by diagnosis; to diagnosticate. See Diagnosticate.

Di`ag*no"sis (?), n.; pl. Diagnoses (#). [NL., fr. Gr. &?;, fr. &?; to distinguish; dia` through, asunder + &?; to know. See Know.] 1. (Med.) The art or act of recognizing the presence of disease from its signs or symptoms, and deciding as to its character; also, the decision arrived at.

2. Scientific determination of any kind; the concise description of characterization of a species.

3. Critical perception or scrutiny; judgment based on such scrutiny; esp., perception of, or judgment concerning, motives and character.

The quick eye for effects, the clear diagnosis of men's minds, and the love of epigram.

Compton Reade.

My diagnosis of his character proved correct.

J. Payn.

Differential diagnosis (Med.), the determination of the distinguishing characteristics as between two similar diseases or conditions.

Di`ag*nos"tic (?), a. [Gr. &?; able to distinguish, fr. &?;: cf. F. diagnostique.] Pertaining to, or furnishing, a diagnosis; indicating the nature of a disease.

Di`ag*nos"tic, n. The mark or symptom by which one disease is known or distinguished from others.

Di`ag*nos"ti*cate (?), v. t. & i. [From Diagnostic.] To make a diagnosis of; to recognize by its symptoms, as a disease.

Di`ag*nos"tics (?), n. That part of medicine which has to do with ascertaining the nature of diseases by means of their symptoms or signs.

His rare skill in diagnostics.

Macaulay.

Di`a*gom"e*ter (?), n. [Gr. &?; to transmit + -meter.] A sort of electroscope, invented by Rousseau, in which the dry pile is employed to measure the amount of electricity transmitted by different bodies, or to determine their conducting power. Nichol.

Di*ag"o*nal (?), a. [L. diagonalis, fr. Gr. &?; from to angle; dia` through + &?; an angle; perh. akin to E. knee: cf. F. diagonal.] (Geom.) Joining two not adjacent angles of a quadrilateral or multilateral figure; running across from corner to corner; crossing at an angle with one of the sides.

Diagonal bond (Masonry), herringbone work. See Herringbone, a. -- Diagonal built (Shipbuilding), built by forming the outer skin of two layers of planking, making angles of about 45° with the keel, in opposite directions. -- Diagonal cleavage. See under Cleavage. -- Diagonal molding (Arch.), a chevron or zigzag molding. -- Diagonal rib. (Arch.) See Cross- springer. -- Diagonal scale, a scale which consists of a set of parallel lines, with other lines crossing them obliquely, so that their intersections furnish smaller subdivisions of the unit of measure than could be conveniently marked on a plain scale. -- Diagonal stratification. (Geol.) Same as Cross bedding, under Cross, a.

Di*ag"o*nal (?), n. 1. A right line drawn from one angle to another not adjacent, of a figure of four or more sides, and dividing it into two parts.

2. (Engin.) A member, in a framed structure, running obliquely across a panel.

3. A diagonal cloth; a kind of cloth having diagonal stripes, ridges, or welts made in the weaving.

Di*ag"o*nal*ly, adv. In a diagonal direction.

Di`a*go"ni*al (?), a. Diagonal; diametrical; hence; diametrically opposed. [Obs.]

Sin can have no tenure by law at all, but is rather an eternal outlaw, and in hostility with law past all atonement; both diagonal contraries, as much allowing one another as day and night together in one hemisphere.

Milton.

Di"a*gram (?), n. [Gr. &?;, fr. &?; to mark out by lines; dia` through + &?; to draw, write: cf. F. diagramme. See Graphic.] 1. (Geom.) A figure or drawing made to illustrate a statement, or facilitate a demonstration; a plan.

2. Any simple drawing made for mathematical or scientific purposes, or to assist a verbal explanation which refers to it; a mechanical drawing, as distinguished from an artistical one.

Indicator diagram. (Steam Engine) See Indicator card, under indicator

Di"a*gram, v. t. To put into the form of a diagram.

Di`a*gram*mat"ic (?), a. Pertaining to, or of the nature of, a diagram; showing by diagram. -- Di`a*gram*mat"ic*ly (#), adv.

Di"a*graph (?), n. [Gr. &?; to draw: cf. F. diagraphe. See Diagram.] A drawing instrument, combining a protractor and scale.

{ Di`a*graph"ic (?), Di`a*graph"ic*al (?), } a. [Cf. F. diagraphique.] Descriptive.

Di`a*graph"ics (?), n. The art or science of descriptive drawing; especially, the art or science of drawing by mechanical appliances and mathematical rule.

Di`a*he`li*o*trop"ic (?), a. [Gr. &?; through, at variance + &?; sun + &?; turning.] (Bot.) Relating or, or manifesting, diaheliotropism.

Di`a*he`li*ot"ro*pism (?), n. (Bot.) A tendency of leaves or other organs of plants to have their dorsal surface faced towards the rays of light.

Di"al (?), n. [LL. dialis daily, fr. L. dies day. See Deity.] 1. An instrument, formerly much used for showing the time of day from the shadow of a style or gnomon on a graduated arc or surface; esp., a sundial; but there are lunar and astral dials. The style or gnomon is usually parallel to the earth's axis, but the dial plate may be either horizontal or vertical.

2. The graduated face of a timepiece, on which the time of day is shown by pointers or hands.

3. A miner's compass.

Dial bird (Zoöl.), an Indian bird (Copsychus saularius), allied to the European robin. The name is also given to other related species. -- Dial lock, a lock provided with one or more plates having numbers or letters upon them. These plates must be adjusted in a certain determined way before the lock can be operated. -- Dial plate, the plane or disk of a dial or timepiece on which lines and figures for indicating the time are placed.

Di"al, v. t. [imp. & p. p. Dialed (?) or Dialled; p. pr. & vb. n. Dialing or Dialling.] 1. To measure with a dial.

Hours of that true time which is dialed in heaven.

Talfourd.

2. (Mining) To survey with a dial. Raymond.

Di"a*lect (?), n. [F. dialecte, L. dialectus, fr. Gr. &?;, fr. &?; to converse, discourse. See Dialogue.] 1. Means or mode of expressing thoughts; language; tongue; form of speech.

This book is writ in such a dialect As may the minds of listless men affect. Bunyan. The universal dialect of the world.

South.

2. The form of speech of a limited region or people, as distinguished from ether forms nearly related to it; a variety or subdivision of a language; speech characterized by local peculiarities or specific circumstances; as, the Ionic and Attic were dialects of Greece; the Yorkshire dialect; the dialect of the learned.

In the midst of this Babel of dialects there suddenly appeared a standard English language.

Earle.

[Charles V.] could address his subjects from every quarter in their native dialect.

Prescott.

Syn. -- Language; idiom; tongue; speech; phraseology. See Language, and Idiom.

Di`a*lec"tal (?), a. Relating to a dialect; dialectical; as, a dialectical variant.

Di`a*lec"tic (?), n. Same as Dialectics.

Plato placed his dialectic above all sciences.

Liddell & Scott.

{ Di`a*lec"tic (?), Di`a*lec"tic*al (?), } a. [L. dialecticus, Gr. &?;: cf. F. dialectique. See Dialect.] 1. Pertaining to dialectics; logical; argumental.

2. Pertaining to a dialect or to dialects. Earle.

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Di`a*lec"tic*al*ly (?), adv. In a dialectical manner.

Di`a*lec*ti"cian (?), n. [Cf. F. dialecticien.] One versed in dialectics; a logician; a reasoner.

Di`a*lec"tics (?), n. [L. dialectica (sc. ars), Gr. &?; (sc. &?;): cf. F. dialectique.] That branch of logic which teaches the rules and modes of reasoning; the application of logical principles to discursive reasoning; the science or art of discriminating truth from error; logical discussion.

Dialectics was defined by Aristotle to be the method of arguing with probability on any given problem, and of defending a tenet without inconsistency. By Plato, it was used in the following senses: 1. Discussion by dialogue as a method of scientific investigation. 2. The method of investigating the truth by analysis. 3. The science of ideas or of the nature and laws of being -- higher metaphysics. By Kant, it was employed to signify the logic of appearances or illusions, whether these arise from accident or error, or from those necessary limitations which, according to this philosopher, originate in the constitution of the human intellect.

Di`a*lec*tol"o*gy (?), n. [Dialect + -logy.] That branch of philology which is devoted to the consideration of dialects. Beck.

Di`a*lec"tor (?), n. One skilled in dialectics.

Di"al*ing (?), n. 1. The art of constructing dials; the science which treats of measuring time by dials. [Written also dialling.]

2. A method of surveying, especially in mines, in which the bearings of the courses, or the angles which they make with each other, are determined by means of the circumferentor.

Di"al*ist, n. A maker of dials; one skilled in dialing.

||Di*al"la*ge (?), n. [NL., fr. Gr. &?; interchange, change, fr. &?; to interchange.] (Rhet.) A figure by which arguments are placed in various points of view, and then turned to one point. Smart.

Di"al*lage (?; 277), n. [Gr. &?; change, alluding to the change and inequality of luster between the natural joints of the mineral.] (Min.) A dark green or bronze-colored laminated variety of pyroxene, common in certain igneous rocks.

Di"al*lel (?), a. [Gr. &?; crossing.] Meeting and intersecting, as lines; not parallel; -- opposed to parallel. [Obs.] Ash.

Di*al"lyl (?), n. (Chem.) A volatile, pungent, liquid hydrocarbon, C6H10, consisting of two allyl radicals, and belonging to the acetylene series.

Di`a*log"ic*al (?), a. [Gr. &?; belonging to discourse.] Relating to a dialogue; dialogistical. Burton.

Di`a*log"ic*al*ly, adv. In the manner or nature of a dialogue. Goldsmith.

Di*al"o*gism (?), n. [Gr. &?;, fr. &?;: cf. F. dialogisme. See Dialogue.] An imaginary speech or discussion between two or more; dialogue. Fulke.

Di*al"o*gist (?), n. [L. dialogista: cf. F. dialogiste.] 1. A speaker in a dialogue.

2. A writer of dialogues. P. Skelton.

{ Di*al`o*gis"tic (?), Di*al`o*gis"tic*al (?), } a. [Gr. &?;.] Pertaining to a dialogue; having the form or nature of a dialogue. -- Di*al`o*gis"tic*al*ly, adv.

Di*al"o*gite (?), n. [From Gr. &?; an arguing.] (Min.) Native carbonate of manganese; rhodochrosite.

Di*al"o*gize (?), v. t. [Gr. &?;: cf. F. dialogiser.] To discourse in dialogue. Fotherby.

Di"a*logue (?; 115), n. [OE. dialogue, L. dialogus, fr. Gr. &?;, fr. &?; to converse, dia` through + &?; to speak: cf. F. dialogue. See Legend.] 1. A conversation between two or more persons; particularly, a formal conservation in theatrical performances or in scholastic exercises.

2. A written composition in which two or more persons are represented as conversing or reasoning on some topic; as, the Dialogues of Plato.

Di"a*logue, v. i. [Cf. F. dialoguer.] To take part in a dialogue; to dialogize. [R.] Shak.

Di"a*logue, v. t. To express as in dialogue. [R.]

And dialogued for him what he would say.

Shak.

Di`al*y*pet"al*ous (?), a. [Gr. dia` through, asunder + &?; to loose + &?; leaf.] (Bot.) Having separate petals; polypetalous.

||Di*al"y*sis (?), n.; pl. Dialyses (#). [L., separation, fr. Gr. &?;, fr. &?; to part asunder, dissolve; dia` through + &?; to loose.] 1. (Gram.) Diæresis. See Diæresis, 1.

2. (Rhet.) Same as Asyndeton.

3. (Med.) (a) Debility. (b) A solution of continuity; division; separation of parts.

4. (Chem.) The separation of different substances in solution, as crystalloids and colloids, by means of their unequal diffusion, especially through natural or artificial membranes.

Di`a*lyt"ic (?), a. [Gr. &?;, fr. &?;. See Dialysis.] Having the quality of unloosing or separating. Clarke.

Dialytic telescope, an achromatic telescope in which the colored dispersion produced by a single object lens of crown glass is corrected by a smaller concave lens, or combination of lenses, of high dispersive power, placed at a distance in the narrower part of the converging cone of rays, usually near the middle of the tube.

Di*al"y*zate (?), n. (Chem.) The material subjected to dialysis.

Di`a*ly*za"tion (?), n. (Chem.) The act or process of dialysis.

Di"a*lyze (?), v. t. [imp. & p. p. Dialyzed (?); p. pr. & vb. n. Dialyzing.] (Chem.) To separate, prepare, or obtain, by dialysis or osmose; to pass through an animal membrane; to subject to dialysis. [Written also dialyse.]

Di"a*lyzed (?), a. Prepared by diffusion through an animal membrane; as, dialyzed iron.

Di"a*ly`zer (?), n. The instrument or medium used to effect chemical dialysis.

Di`a*mag"net (?), n. [Pref. dia- + magnet.] A body having diamagnetic polarity.

Di`a*mag*net"ic (?), a. Pertaining to, or exhibiting the phenomena of, diamagnetism; taking, or being of a nature to take, a position at right angles to the lines of magnetic force. See Paramagnetic.

Diamagnetic attraction. See under Attraction.

Di`a*mag*net"ic, n. Any substance, as bismuth, glass, phosphorous, etc., which in a field of magnetic force is differently affected from the ordinary magnetic bodies, as iron; that is, which tends to take a position at right angles to the lines of magnetic force, and is repelled by either pole of the magnet.