DIASTOl [C 



372 



DICROTIC 



its rhythm: or beat. It i- applied also to 



the dilatati b) the heart's con- 

 tra< • 



Diastolic drawing apart]. 



D. Impulse, the back stroke. 



D. Murmur. See Mitrt D. Thrill, the vibra- 



I in the i the In-art daring the diastole 



Diastrephia . to 



turn] Insanit) marked b) and by 



Diatacuc , to make readj ]. 



Pi D. Action, the supposed molecular 



hi brain i 

 iratory to coordinated motor 



Dtatela n]. The velum inter- 



Diaterm.i [Ad, 1 . . nd], 



• the diacele. It has a nearly 

 .1 direction. 

 Diathermal or Diathermanous [di-ath-er / -mal, di- 

 , through ; , , heat], Trans- 



iphanous to the waves of radiant heat. 

 Diathermanc . [Ad, through; 8&i 



Diathesis | . through ; TiBtvai, to ar- 



i ondltion of the body whereby it is 



ertain di -uch as gout, cal- 



cu. It may be acquired ot heredi- 



D., Hemorrhagic. See Hemophilia. 



Diathetic '-ik) [Ad, through; rrftra;, to ar- 



• a diathi 

 Diatom i ine of the Diatomacece, a group 



Diatomic rn'-ik) [dig, two ; irofiog, atom]. In 



sting of two atoms ; specifically applied 



that have two hydrogen atoms united to the 



nu a. 



Diatomin [Ad, through ; rifivetv, to 



cut]. I wish- brown coloring-matter of diatoms. 



It : inthin. 



Diaxon [Ac, two ; dfwv, axis]. In biology, 



having two a 

 Diazo- ; azotum, nitrogen]. In 



mistry, a prefix signifying that a compound contains 

 . I ,1b, united with a radical consisting of two 

 nit: D.-acid, one of certain volatile 



liqi yellow color and peculiar odor, which 



-.; 1 with steam or under reduced pres 

 ■• are slightly soluble in water, but mix 

 ■i with ether. D. -compound, 

 in ntaining a group consisting 



'.'■'■ ted with a radii al consisting of 



the name). D. -reac- 

 tion or test, a urinary test, originally thought to be 



teric fever. It is 



i in the ui i thy persi ms. I he test is 



2'>>> parts of sulphanilic acid solution 



Union in water) with io parts of pure 



■ t nitrite of sodium 



| ■ this mixture add an equal 



f "rin- mmonia to render the 



red denotes the 



Diazobenzene < rim< 



vro- 



Dib 



Dibasic ] Having 



D. Acids. 



Dibenzyl [di-ben'-zil) [Ac, twice ; benzoin], v" M H u . 

 A i. impound prepared by the action of sodium upon 

 benzyl chlorid. It crystallizes in large prisms, melt- 

 ing at 52° < '. and boiling at 284 C. 



Diblastic [di-blas'-tik) [Ac, double ; &Xaar6g, germ] 

 Referring t" any theory of disease thai ascribes it to a 

 double agency. 



Dibothrium [di-both' '-re-uni) [L.]. A genus of ces 

 tode worms. D. latum. See Bothriocephalus lotus. 



Dibromindone {di-bro-min f -don) [Ac, double; (Jpi 

 a stench], 1 ',,1 1,l!r.,< >. A compound derived from 

 dibromcinnamic acid. It consists of orange-yellow 

 needles, with an odor resembling that of quinone. It 

 melts at 123°. 



Dicephalism (di-sef'-al-izm) [A'c, two; Ki<pa/Jj, head]. 

 1 he condition of having two heads. 



Dicephalous {di-sef'-al-us) [Ac, two; KFpa/J/, head]. 

 Two headed. 



Dicephalus {di-sef f -al-us) [Ac, two ; kc<^u7.Ij, a head]. 

 A monster having two heads. 



Dicerous (dis'-er-us) [Ac, two; Kipar, a horn]. In 

 biology, having two antennae. 



Dichasium (di-ka'-se-um) [AjacYc, division]. In 

 biology, applied to a cyme having two axes. 



Dichastasis [di-kas f -tas-is\ [dixaotg, division]. In 

 biology, spontaneous fission. 



Dichasteres [di-kas-te' '-rlz) [A^dfe/w, to divide]. An 

 old name for the incisor teeth. 



Dichlamydeous (di-ilam-id'-e-us) [Ac, two ; jAa^ic, a 

 mantle]. In biology, applied to flowers having both 

 floral envelops. 



Dichogamy (di-kog* '-a-me\ [A'^'«, in two ; -} tutor, mar- 

 riage]. In biology, a provision for cross-fertilization 

 of flowers by the maturation of the reproductive ele- 

 ments of the same flower at different times. 



Dichotomous Uli-kot' '-o-mus) [Aja, in two ; riuveiv, 

 to cut]. In biology, divided, forked or having a 

 dual arrangement. 



Dichroism [di'-kro-izni) [Ac, double; j/ioa, color]. 

 The phenomenon of difference of color in bodies 

 when viewed by reflected or by transmitted light. 



Dichromatism {ili-kro' -mat-izm). Same as Color- 

 blindness. 



Dicinchonin (di-sin'-kon-in) [Ac, double ; cinchona], 

 C s8 H 44 N 4 2 . An alkaloid of Cinchona bark, an 

 amorphous solid, melting at 40 C, readily soluble in 

 alcohol and ether. 



Diclesium [di-kle' '-se-um) [Ac, two ; ttXeieiv, close]. In 

 biology, an achenium having a persistent calyx or 

 perianth. 



Diclinous {di-klV '-nus) [A'c, two; n'/ivr/, abed]. In 

 biology, having the stamens and pistils in separate 

 flowers. 



Dicochirurgea (di-ho-hi-rer'-je-ah) \_<Vikt], justice; 

 %eip surgery]. Forensic surgery. 



Dicotoin {di-k(/ -to-in) [Ac, double; Coto~\. A deriva- 

 tive of cotoin present iii coto bark. 



Dicotyledon [di-kot-il-e / -don) [Ac, two; Korvk^Sim, 

 a cavity]. In biology, a term introduced by J. Ray 

 in 16S2, foraplant whose embryo has two seed-leaves 

 or cotyledons. 



Dicranous {di-tyra' -nus) [dlnpavog, two-headed]. 

 1 bicephalous 



Dicranus [di-kra' -nus) [Ac, double; upavov, head]. 

 A dicephalous monster. 



Dicrotic {di-krot'-ik^SinpoTog, double beating]. Having 

 a doubl D. Pulse, a term applied to a pulse 



that imparts the sensation of a double beat at each 

 pulsation. D. Wave, the wave of recoil, or the 

 ml smaller ascending wave of the sphygmographic 

 tracing. It is generated by closure oi the aortic 

 valves. 



