Webster's Dictionary, 1913

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Diameter noun [ French diamètre , Latin diametros , from Greek ...; dia` through + ... measure. See Meter .]
1. (Geom.) (a) Any right line passing through the center of a figure or body, as a circle, conic section, sphere, cube, etc., and terminated by the opposite boundaries; a straight line which bisects a system of parallel chords drawn in a curve. (b) A diametral plane.

2. The length of a straight line through the center of an object from side to side; width; thickness; as, the diameter of a tree or rock.

» In an elongated object the diameter is usually taken at right angles to the longer axis.

3. (Architecture) The distance through the lower part of the shaft of a column, used as a standard measure for all parts of the order. See Module .

Conjugate diameters . See under Conjugate .

Diametral adjective [ Greek French diamétral .] Pertaining to a diameter; diametrical.

Diametral curve , Diametral surface (Geom.) , any line or surface which bisects a system of parallel chords drawn in a curve or surface. -- Diametral planes (Crystal.) , planes in which two of the axes lie.

Diametral noun A diameter. [ Obsolete] Sir T. Browne.

Diametrally adverb Diametrically.

Diametric, Diametrical adjective
1. Of or pertaining to a diameter.

2. As remote as possible, as if at the opposite end of a diameter; directly adverse.

Diametrically adverb In a diametrical manner; directly; as, diametrically opposite.

Whose principles were diametrically opposed to his.
Macaulay.

Diamide noun [ Prefix di- + amide .] (Chemistry) Any compound containing two amido groups united with one or more acid or negative radicals, -- as distinguished from a diamine. Confer Amido acid , under Amido , and Acid amide , under Amide .

Diamido- adjective (Chemistry) A prefix or combining form of Diamine . [ Also used adjectively.]

Diamine noun [ Prefix di- + amine .] (Chemistry) A compound containing two amido groups united with one or more basic or positive radicals, -- as contrasted with a diamide .

» In chemical nomenclature, if any amine or diamine is named by prefixing the nitrogen group, the name of the latter takes the form of amido , diamido , etc., thus ethylene diamine , C 2 H 4 .(NH 2 ) 2 , is also called diamido-ethylene .

Diamond noun [ Middle English diamaund , diamaunt , French diamant , corrupted, from Latin adamas , the hardest iron, steel, diamond, Greek .... Perh. the corruption is due to the influence of Greek ... transparent. See Adamant , Tame .]
1. A precious stone or gem excelling in brilliancy and beautiful play of prismatic colors, and remarkable for extreme hardness.

» The diamond is native carbon in isometric crystals, often octahedrons with rounded edges. It is usually colorless, but some are yellow, green, blue, and even black. It is the hardest substance known. The diamond as found in nature (called a rough diamond ) is cut, for use in jewelry, into various forms with many reflecting faces, or facets, by which its brilliancy is much increased. See Brilliant , Rose . Diamonds are said to be of the first water when very transparent, and of the second or third water as the transparency decreases.

2. A geometrical figure, consisting of four equal straight lines, and having two of the interior angles acute and two obtuse; a rhombus; a lozenge.

3. One of a suit of playing cards, stamped with the figure of a diamond.

4. (Architecture) A pointed projection, like a four-sided pyramid, used for ornament in lines or groups.

5. (Baseball) The infield; the square space, 90 feet on a side, having the bases at its angles.

6. (Print.) The smallest kind of type in English printing, except that called brilliant , which is seldom seen.

» This line is printed in the type called Diamond .

Black diamond , coal; (Min.) See Carbonado . -- Bristol diamond . See Bristol stone , under Bristol . -- Diamond beetle (Zoology) , a large South American weevil ( Entimus imperialis ), remarkable for its splendid luster and colors, due to minute brilliant scales. -- Diamond bird (Zoology) , a small Australian bird ( Pardalotus punctatus , family Ampelidæ .). It is black, with white spots. -- Diamond drill (Engineering) , a rod or tube the end of which is set with black diamonds; -- used for perforating hard substances, esp. for boring in rock. -- Diamond finch (Zoology) , a small Australian sparrow, often kept in a cage. Its sides are black, with conspicuous white spots, and the rump is bright carmine. -- Diamond groove (Iron Working) , a groove of V-section in a roll. -- Diamond mortar (Chemistry) , a small steel mortar used for pulverizing hard substances. - - Diamond-point tool , a cutting tool whose point is diamond-shaped. -- Diamond snake (Zoology) , a harmless snake of Australia ( Morelia spilotes ); the carpet snake. -- Glazier's diamond , a small diamond set in a glazier's tool, for cutting glass.

Diamond adjective Resembling a diamond; made of, or abounding in, diamonds; as, a diamond chain; a diamond field.

Diamond anniversary, jubilee etc. One celebrated upon the completion of sixty, or, according to some, seventy-five, years from the beginning of the thing commemorated.

Diamond State Delaware; -- a nickname alluding to its small size.

Diamond-back noun (Zoology) The salt-marsh terrapin of the Atlantic coast ( Malacoclemmys palustris ).

Diamond-shaped adjective Shaped like a diamond or rhombus.

Diamonded adjective
1. Having figures like a diamond or lozenge.

2. Adorned with diamonds; diamondized. Emerson.

Diamondize transitive verb To set with diamonds; to adorn; to enrich. [ R.]

Diamondizing of your subject.
B. Jonson.

Diamylene noun [ Prefix di- + amylene .] (Chemistry) A liquid hydrocarbon, C 10 H 20 , of the ethylene series, regarded as a polymeric form of amylene.

Dian adjective Diana. [ Poetic]

Diana noun [ Latin Diana .] (Myth.) The daughter of Jupiter and Latona; a virgin goddess who presided over hunting, chastity, and marriage; -- identified with the Greek goddess Artemis .

And chaste Diana haunts the forest shade.
Pope.

Diana monkey (Zoology) , a handsome, white-bearded monkey of West Africa ( Cercopithecus Diana ).

Diandria noun plural [ New Latin , from Greek di- = di`s- twice + ..., ..., a man, a male.] (Botany) A Linnæan class of plants having two stamens.

Diandrian adjective Diandrous.

Diandrous noun [ Confer French diandre .] (Botany) Of or pertaining to the class Diandria; having two stamens.

Dianium noun [ New Latin , from Latin Diana ; either as the name of the Roman goddess, or from its use in Middle English as a name of silver.] (Chemistry) Same as Columbium . [ Obsolete]

Dianoetic adjective [ Greek ...; dia` through + ... to revolve in the mind.] (Metaph.) Pertaining to the discursive faculty, its acts or products.

I would employ . . . dianoetic to denote the operation of the discursive, elaborative, or comparative faculty.
Sir W. Hamilton.

Dianoialogy noun [ Greek ... thought + -logy .] The science of the dianoetic faculties, and their operations. Sir W. Hamilton.

Dianthus noun [ New Latin , from Greek ..., gen. ..., Zeus + 'a`nqos flower.] (Botany) A genus of plants containing some of the most popular of cultivated flowers, including the pink, carnation, and Sweet William.

Diapase noun Same as Diapason . [ Obsolete]

A tuneful diapase of pleasures.
Spenser.

Diapasm noun [ Latin diapasma , Greek ..., from ...; dia` through + ... to sprinkle: confer French diapasme .] Powdered aromatic herbs, sometimes made into little balls and strung together. [ Obsolete]

Diapason noun [ Latin , from Greek diapasw^n ( i. e. , "h dia` pasw^n chordw^n symfoni`a the concord of the first and last notes, the octave); dia` through + pasw^n , gen. plural of pa^s all: confer French diapason . Confer Panacea .]
1. (Gr. Mus.) The octave, or interval which includes all the tones of the diatonic scale.

2. Concord, as of notes an octave apart; harmony.

The fair music that all creatures made . . .
In perfect diapason .
Milton.

3. The entire compass of tones.

Through all the compass of the notes it ran,
The diapason closing full in man.
Dryden.

4. A standard of pitch; a tuning fork; as, the French normal diapason .

5. One of certain stops in the organ, so called because they extend through the scale of the instrument. They are of several kinds, as open diapason , stopped diapason , double diapason , and the like.

Diapedesis noun [ New Latin , from Greek ... a leaping or oozing through, from ... to leap through; dia` through + ... to leap.] (Medicine) The passage of the corpuscular elements of the blood from the blood vessels into the surrounding tissues, without rupture of the walls of the blood vessels.

Diapente noun [ Latin , from Greek ... a fifth; dia` through + ... five: confer French diapente .]
1. (Anc. Mus.) The interval of the fifth.

2. (Medicine) A composition of five ingredients.

Diaper noun [ Old French diaspre , diapre , diaspe , sort of figured cloth, Italian diaspro jasper, diaspo figured cloth, from Latin jaspis a green-colored precious stone. See Jasper .]
1. Any textile fabric (esp. linen or cotton toweling) woven in diaper pattern. See 2.

2. (Fine Arts) Surface decoration of any sort which consists of the constant repetition of one or more simple figures or units of design evenly spaced.

3. A towel or napkin for wiping the hands, etc.

Let one attend him with a silver basin, . . .
Another bear the ewer, the third a diaper .
Shak.

4. An infant's breechcloth.

Diaper transitive verb
1. To ornament with figures, etc., arranged in the pattern called diaper, as cloth in weaving. " Diapered light." H. Van Laun.

Engarlanded and diapered
With in wrought flowers.
Tennyson.

2. To put a diaper on (a child).

Diaper intransitive verb To draw flowers or figures, as upon cloth. "If you diaper on folds." Peacham.

Diapering noun Same as Diaper , noun , 2.

Diaphane noun [ Confer French diaphane diaphanous. See Diaphanous .] A woven silk stuff with transparent and colored figures; diaper work.

Diaphaned adjective [ Confer Old French diaphaner to make transparent. See Diaphanous .] Transparent or translucent. [ R.]

Diaphaneity noun [ Confer French diaphanéité . See Diaphanous .] The quality of being diaphanous; transparency; pellucidness.

Diaphanic adjective [ See Diaphanous .] Having power to transmit light; transparent; diaphanous.

Diaphanie noun The art of imitating stained glass with translucent paper.

Diaphanometer noun [ Greek ... transparent + -meter .] An instrument for measuring the transparency of the air.

Diaphanoscope noun [ Greek ... transparent + -scope .] (Photog.) A dark box constructed for viewing transparent pictures, with or without a lens.

Diaphanotype noun [ Greek ... transparent + -type .] (Photog.) A colored photograph produced by superimposing a translucent colored positive over a strong uncolored one.

Diaphanous adjective [ Greek ..., from ... to show or shine through; dia` through + ... to show, and in the passive, to shine: confer French diaphane . See Phantom , and confer Diaphane , Diaphanic .] Allowing light to pass through, as porcelain; translucent or transparent; pellucid; clear.

Another cloud in the region of them, light enough to be fantastic and diaphanous .
Landor.

Diaphanously adverb Translucently.

Diaphemetric adjective [ Greek dia` through + ... touch + ... measure.] (Physiol.) Relating to the measurement of the tactile sensibility of parts; as, diaphemetric compasses. Dunglison.

Diaphonic, Diaphonical adjective [ Greek dia` through + ... sound, tone.] Diacoustic.

Diaphonics noun The doctrine of refracted sound; diacoustics.

Diaphoresis noun [ Latin , from Greek ..., from ... to carry through, to throw off by perspiration; dia` through + ... to carry.] (Medicine) Perspiration, or an increase of perspiration.