Webster's Dictionary, 1913

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Diœciously adverb (Biol.) In a diœcious manner.

Diœciously hermaphrodite (Botany) , having flowers structurally perfect, but practically diœcious, -- those on one plant producing no pollen, and those on another no ovules.

Diœciousness noun (Biol.) The state or quality of being diœcious.

Diœcism noun (Biol.) The condition of being diœcious.

Dia-, Di- [ Greek dia` through; orig., dividing into two parts; akin to ... two. See Two , and confer 1st Di- .] A prefix denoting through ; also, between , apart , asunder , across . Before a vowel dia- becomes di -; as, di actinic; di electric, etc.

Diabase noun [ French diabase , from Greek ... a crossing or passing over, from ...; ... + ... 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 .

Diabaterial adjective [ Greek ... ... (sc. ...) offerings before crossing the border, from ... to pass over. See Diabase .] Passing over the borders. [ R.] Mitford.

Diabetes noun [ New Latin , from Greek ..., from ... to pass or cross over. See Diabase .] (Medicine) 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.

Diabetic, Diabetical adjective Pertaining to diabetes; as, diabetic or diabetical treatment. Quian.

Diabetic sugar . (Chemistry) Same as Dextrose .

Diablerie, Diabley noun [ French diablerie , from diable devil, Latin diabolus . See Devil .] Devilry; sorcery or incantation; a diabolical deed; mischief.

Diabolic, Diabolical adjective [ Latin diabolicus , Greek ... devilish, slanderous: confer French 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 , adverb -- Di`a*bol"ic*al*ness , noun

Diabolify transitive verb [ Latin diabolus devil + -fy .] To ascribed diabolical qualities to; to change into, or to represent as, a devil. [ R.] Farindon.

Diabolism noun
1. Character, action, or principles appropriate to the devil.

2. Possession by the devil. Bp. Warburton.

Diabolize transitive verb To render diabolical. [ R.]

Diabolo (dĭ*ăb"o*lō) noun An old game or sport (revived under this name) consisting in whirling on a string, fastened to two sticks, a small somewhat spool-shaped object (called the diabolo ) so as to balance it on a string, toss it in the air and catch it, etc.

Diacatholicon noun [ Prefix dia- + catholicon .] (Medicine) A universal remedy; -- name formerly to a purgative electuary.

Diacaustic adjective [ Prefix dia- + caustic .] (Opt.) Pertaining to, or possessing the properties of, a species of caustic curves formed by refraction. See Caustic surface , under Caustic .

Diacaustic noun
1. (Medicine) 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.

Diachylon Di*ach"y*lum noun [ New Latin diachylum , from Greek ... 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.

Diacid adjective [ Prefix di- + acid .] (Chemistry) Divalent; -- said of a base or radical as capable of saturating two acid monad radicals or a dibasic acid. Confer Dibasic , adjective , and Biacid .

Diacodium noun [ Latin , from Greek ... ... from poppy heads; dia` through, from + ... head, a poppy head.] A sirup made of poppies.

Diaconal adjective [ Late Latin diaconalis : confer French diaconal . Confer Deacon .] Of or pertaining to a deacon.

Diaconate noun [ Latin diaconatus : confer French diaconat .] The office of a deacon; deaconship; also, a body or board of deacons.

Diaconate adjective Governed by deacons. " Diaconate church." T. Goodwin.

Diacope noun [ Latin , from Greek ... a cutting in two; dia` through + ....] (Gram.) Tmesis.

Diacoustic adjective [ Prefix di- + acoustic .] Pertaining to the science or doctrine of refracted sounds.

Diacoustics noun [ Confer French 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 .

Diacritic, Diacritical adjective [ Greek ..., from ... 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, ā, ă, ä, ō, ŏ, 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.

Diactinic adjective [ Prefix di- + actinic .] (Physics) Capable of transmitting the chemical or actinic rays of light; as, diactinic media.

Diadelphia noun plural [ New Latin , from Greek di- = di`s- twice + ... brother.] (Botany) A Linnæan class of plants whose stamens are united into two bodies or bundles by their filaments.

Diadelphian, Diadelphous adjective [ Confer French diadelphe .] (Botany) 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).

Diadem noun [ French diadème , Latin diadema , from Greek ..., from ... to bind round; dia` through, across + ... to bind; confer Sanskrit 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 . (Zoology) See Indri . -- Diadem spider (Zoology) , the garden spider.

Diadem transitive verb 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.

Diadrom noun [ Greek ... a running through; dia` through + ..., used as inf. aor. of ... to run.] A complete course or vibration; time of vibration, as of a pendulum. [ Obsolete] Locke.

Diageotropic adjective [ Greek dia` through, at variance + ... earth + ... turning.] (Botany) Relating to, or exhibiting, diageotropism.

Diageotropism noun (Botany) The tendency of organs (as roots) of plants to assume a position oblique or transverse to a direction towards the center of the earth.

Diaglyph noun [ Greek ... to engrave; dia` through + ... to carve.] An intaglio. Mollett.

Diaglyphic, Diaglyphtic adjective Represented or formed by depressions in the general surface; as, diaglyphic sculpture or engraving; -- opposed to anaglyphic .

Diagnose transitive verb & i. To ascertain by diagnosis; to diagnosticate. See Diagnosticate .

Diagnosis noun ; plural Diagnoses . [ New Latin , from Greek ..., from ... to distinguish; dia` through, asunder + ... to know. See Know .]
1. (Medicine) 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 (Medicine) , the determination of the distinguishing characteristics as between two similar diseases or conditions.

Diagnostic adjective [ Greek ... able to distinguish, from ...: confer French diagnostique .] Pertaining to, or furnishing, a diagnosis; indicating the nature of a disease.

Diagnostic noun The mark or symptom by which one disease is known or distinguished from others.

Diagnosticate transitive verb & i. [ From Diagnostic .] To make a diagnosis of; to recognize by its symptoms, as a disease.

Diagnostics noun 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.

Diagometer noun [ Greek ... 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.

Diagonal adjective [ Latin diagonalis , from Greek ... from to angle; dia` through + ... an angle; perhaps akin to English knee : confer French 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 , adjective -- 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 (Architecture) , a chevron or zigzag molding. -- Diagonal rib . (Architecture) 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 , adjective

Diagonal noun
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. (Engineering) 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.

Diagonally adverb In a diagonal direction.

Diagonial adjective Diagonal; diametrical; hence; diametrically opposed. [ Obsolete]

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.

Diæresis, Dieresis noun ; plural Diæreses or Diereses . [ Latin diaeresis , Greek ..., from ... 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 .

Diæretic adjective [ Greek ... dividing.] (Medicine) Caustic. [ Obsolete]