Diph*thon"gal (?; 115), a. Relating or belonging to a diphthong; having the nature of a diphthong. -- Diph*thon"gal*ly, adv.
Diph*thon"gal*ize (?; 115), v. t. To make into a diphthong; to pronounce as a diphthong.
Diph`thon*ga"tion (?), n. See Diphthongization.
Diph*thong"ic (?; 115), a. Of the nature of diphthong; diphthongal. H. Sweet.
Diph`thong*i*za"tion (?), n. The act of changing into a diphthong. H. Sweet.
Diph"thong*ize (?), v. t. & i. To change into a diphthong, as by affixing another vowel to a simple vowel. "The diphthongized long vowels." H. Sweet.
Diph`y*cer"cal (?), a. [Gr. difyh`s double (di- = di`s- twice + fy`ein to produce) + ke`rkos tail.] (Anat.) Having the tail fin divided into two equal parts by the notochord, or end of the vertebral column; protocercal. See Protocercal.
Diph`y*gen"ic (-jn"k), a. [Gr. difyh`s of double form + - genic.] (Zoöl.) Having two modes of embryonic development.
[1913 Webster]
Diph"yl*lous (df"l*ls or d*fl"-), a. [Gr. di- = di`s- twice + fy`llon leaf: cf. F. diphylle.] (Bot.) Having two leaves, as a calyx, etc.
[1913 Webster]
Diph"y*o*dont (?), a. [Gr. &?; double (di- = di`s- twice + &?; to produce) + 'odoy`s, 'odo`ntos, tooth.] (Anat.) Having two successive sets of teeth (deciduous and permanent), one succeeding the other; as, a diphyodont mammal; diphyodont dentition; -- opposed to monophyodont. -- n. An animal having two successive sets of teeth.
Diph`y*o*zo"oid (?), n. [Gr. &?; of double from + E. zooid.] (Zoöl.) One of the free-swimming sexual zooids of Siphonophora.
Di*pla"nar (?), a. [Pref. di- + plane.] (Math.) Of or pertaining to two planes.
Di*plei"do*scope (?), n. [Gr. &?; double + &?; image + -scope.] (Astron.) An instrument for determining the time of apparent noon. It consists of two mirrors and a plane glass disposed in the form of a prism, so that, by the reflections of the sun's rays from their surfaces, two images are presented to the eye, moving in opposite directions, and coinciding at the instant the sun's center is on the meridian.
Dip`lo*blas"tic (?), a. [Gr. &?; doublet + -blast + -ic.] (Biol.) Characterizing the ovum when it has two primary germinal layers.
Dip`lo*car"di*ac (?), a. [Gr. &?; double + E. cardiac.] (Anat.) Having the heart completely divided or double, one side systemic, the other pulmonary.
||Dip`lo*coc"cus (?), n.; pl. Diplococci (#). [NL., fr. Gr. diplo`os twofold + ko`kkos grain, seed.] (Biol.) A form of micrococcus in which cocci are united in a binary manner. See Micrococcus.
||Dip"lo*ë (?), n. [NL., fr. Gr. &?; fold, fr. &?; twofold, double.] (Anat.) The soft, spongy, or cancellated substance between the plates of the skull.
Dip`lo*et"ic (?), a. (Anat.) Diploic.
Dip`lo*gen"ic (?), a. [Gr. &?; double + the root of &?; to produce.] Partaking of the nature of two bodies; producing two substances. Wright.
Di*plo"ic (?), a. (Anat.) Of or pertaining to the diploë.
Dip"loid (?), n. [Gr. &?; twofold + -oid.] (Crystallog.) A solid bounded by twenty- four similar quadrilateral faces. It is a hemihedral form of the hexoctahedron.
Di*plo"ma (?), n.; pl. Diplomas (#). [L., fr. Gr. &?;, fr. &?; to double, fr. &?; twofold. See Double.] A letter or writing, usually under seal, conferring some privilege, honor, or power; a document bearing record of a degree conferred by a literary society or educational institution.
Di*plo"ma*cy (?), n. [F. diplomatie. This word, like supremacy, retains the accent of its original. See Diploma.] 1. The art and practice of conducting negotiations between nations (particularly in securing treaties), including the methods and forms usually employed.