Dip`ter*yg"i*an (?), a. [Gr. di- = di`s- twice + &?; a fin, dim. of &?; wing.] (Zoöl.) Having two dorsal fins; -- said of certain fishes.
Dip"tote (?), n. [Gr. &?;; di- = di`s- twice + &?; falling, fr. &?; to fall: cf. F. diptote.] (Gram.) A noun which has only two cases. Andrews.
Dip"tych (?), n. [L. diptycha, pl., fr. Gr. &?; folded, doubled; di- = di`s- twice + &?; to fold, double up.] 1. Anything consisting of two leaves. Especially: (a) (Roman Antiq.) A writing tablet consisting of two leaves of rigid material connected by hinges and shutting together so as to protect the writing within. (b) A picture or series of pictures painted on two tablets connected by hinges. See Triptych.
2. A double catalogue, containing in one part the names of living, and in the other of deceased, ecclesiastics and benefactors of the church; a catalogue of saints.
Di*pyre" (?), n. [Gr. di- = di`s- twice fire.] (Min.) A mineral of the scapolite group; -- so called from the double effect of fire upon it, in fusing it, and rendering it phosphorescent.
Di`py*re"nous (?), a. [Pref. di- + pyrene.] (Bot.) Containing two stones or nutlets.
Di*pyr"i*dine (?; 104), n. [Pref. di- + pyridine.] (Geom.) A polymeric form of pyridine, C10H10N2, obtained as a colorless oil by the action of sodium on pyridine.
Di*pyr"i*dyl (?), n. [Pref. di- + pyridine + -yl.] (Chem.) A crystalline nitrogenous base, C10H8N2, obtained by the reduction of pyridine.
Di*ra`di*a"tion (?), n. [Pref. di- + radiation.] The emission and diffusion of rays of light.
Dire (dr), a. [Compar. Direr (?); superl. Direst.] [L. dirus; of uncertain origin.] 1. Ill-boding; portentous; as, dire omens.