1. (Bot.) One of the Diatomaceæ, a family of minute unicellular Algæ having a siliceous covering of great
delicacy, each individual multiplying by spontaneous division. By some authors diatoms are called Bacillariæ,
but this word is not in general use.
2. A particle or atom endowed with the vital principle.
The individual is nothing. He is no more than the diatom, the bit of protoplasm.Mrs. E. Lynn Linton.
(Di`a*tom"ic) a. [Pref. di- + atomic.] (Chem.) (a) Containing two atoms. (b) Having two
replaceable atoms or radicals.
(Di*at"o*mous) a. [Gr. dia`tomos cut through, fr. diate`mnein to cut through; dia` through
+ te`mnein to cut. Cf. Diatom.] (Min.) Having a single, distinct, diagonal cleavage; said of crystals.
Diatonic scale (Mus.), a scale consisting of eight sounds with seven intervals, of which two are semitones
and five are whole tones; a modern major or minor scale, as distinguished from the chromatic scale.
(Di`a*ton"ic) a. [L. diatonicus, diatonus, Gr. fr. to stretch out; dia` through + to stretch: cf. F.
diatonique. See Tone.] (Mus.) Pertaining to the scale of eight tones, the eighth of which is the octave
of the first.
(Di`a*ton"ic*al*ly) adv. In a diatonic manner.
(Di"a*tribe) n. [L. diatriba a learned discussion, Gr. prop., a wearing away of time, fr. to rub
away, spend time; dia` through + to rub: cf. L. terere, F. trite: cf. F. diatribe.] A prolonged or exhaustive
discussion; especially, an acrimonious or invective harangue; a strain of abusive or railing language; a
The ephemeral diatribe of a faction.John Morley.
(Di*at"ri*bist) n. One who makes a diatribe or diatribes.
(||Di`a*try"ma) n. [NL., from Gr. dia` through + hole.] (Paleon.) An extinct eocene bird from
New Mexico, larger than the ostrich.
(Di`a*zeuc"tic Di`a*zeu"tic) a. [Gr. disjunctive, fr. to disjoin; dia` through, asunder + to join,
yoke.] (Anc. Mus.) Disjoining two fourths; as, the diazeutic tone, which, like that from F to G in modern
music, lay between two fourths, and, being joined to either, made a fifth. [Obs.]
(Di*az"o-) [Pref. di- + azo-] (Chem.) A combining form meaning pertaining to, or derived
from, a series of compounds containing a radical of two nitrogen atoms, united usually to an aromatic
radical; as, diazo-benzene, C6H5.N2.OH.
Diazo compounds are in general unstable, but are of great importance in recent organic chemistry. They
are obtained by a partial reduction of the salts of certain amido compounds.
Diazo reactions (Chem.), a series of reactions whereby diazo compounds are employed in substitution.
These reactions are of great importance in organic chemistry.
(Di*az"o*tize) v. t. (Chem.) To subject to such reactions or processes that diazo compounds,
or their derivatives, shall be produced by chemical exchange or substitution.
(Dib) v. i. To dip. [Prov. Eng.] Walton.
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