DICODEYLMETHANE 



218 



DIGITALISM 



Dicodeylmethane (di-co-de-il-meth* '-an). The hydro- 

 chloric! of a condensation-product of one molecule of 

 for,maldehyd with two molecules of codein. A soluble 

 mass melting at 140 C. 



Didelphic, Didelphous {di-del'-fik, -/us) [r5/c, double; 

 fie?jpvg, the matrix]. Having a double uterus. 



Diductor {di-duk' -tor) [diducere, to draw apart]. A 

 muscle which in action produces diduction. 



Didymin {did'-im-in) [didvfioi, the testes]. A dry 

 preparation made from the testes of the ox. Aphro- 

 disiac dose, 5 gr. (0.3 gm. ). In larger doses it is hyp- 

 notic. 



Didymium. (See Illus. Diet.) D. Chlorid, Di 2 Cl 6 

 + I2H 2 0, rose-colored crystals soluble in water and 

 alcohol. A recommended non-caustic disinfectant in 

 solutions of 1:500 to 1: 1000. D. Nitrate, Di 2 (NO s ) 6 

 -+- I2H 2 0, rose-red crystals soluble in water and alco- 

 hol. It is an efficient bactericide. D. Salicylate, a 

 waste product in the manufacture of mantles for incan- 

 descent gas-lights. It is an excellent topical, siccative, 

 and antiseptic, employed in form of 10 fc pomade in 

 burns and cutaneous affections. Syn., Dymal. D. 

 Sulfate, Di 2 (S0 4 ) 3 + 9H 2 0, hygroscopic crystals used 

 as a disinfectant in the form of a dusting-powder. 



Dielectric. (See Illus. Diet.) D., Pseudo-, any com- 

 pound which acts as a dielectric when pure but as an 

 electrolyte when mixed with other members of its own 

 class. 



Diestrous, Dicestrous (di-es'-trus). Pertaining to a 

 type of sexual season in female animals in which there 

 is a short period of sexual rest. 



Diestrum, Dicestrum (di-es' -trum) [did, between ; 

 oioTpog, gad-fly]. Heape's term for the short period 

 of sexual rest characteristic of some female animals. 

 Cf. Estrum (Illus. Diet.), Anestri/711, Monestrum. 



Diet. (See Illus. Diet.) D., Bland, one consisting of 

 food that is free from the ingredients which excite heat, 

 but containing all the nutrients — albumin, carbohy- 

 drates, and fat — necessary for the maintenance of man. 



Diethyl (di-etli'-il). C 4 H 10 . A double molecule of 

 ethyl; in a free state it constitutes normal butane. D. 

 Acetal. See Acetal (Illus. Diet.). D. acetone, D.- 

 ketone. See Propione (Illus. Diet.). D. Disulfid. 

 Same as Ethyl bisulfid. D.-glycocoll-guaiacoll 

 Hydrochlorate, an antiseptic used in pulmonary 

 tuberculosis, ozena, etc. Dose, 1 5 to 60 gr. Syn., 

 Gujasanol. D.-sulfondiethylmethane. See Tetro- 

 nal (Illus. Diet.). D.-sulfondimethylmethane. 

 See Sulphonal (Illus. Diet.). D.-sulfonmethyl- 

 ethylmethane. See Trional (Illus. Diet.). 



Diethylenediamin (di-eth-il-eii-di-an/'-ii/). See Pipera- 

 zin (Illus. Diet.). 



Dietotherapy {di-et-o-ther'-ap-e) [Aiatra, mode of life ; 

 Bepa-eia, therapy]. The regulation of diet for thera- 

 peutic purposes. 



Differentiation. (See Illus. Diet.) D., Pneumatic, 

 a mode of treatment for pulmonary diseases consisting 

 in breathing rarefied or compressed air. D., Preco- 

 cious, applied to eggs that admit of complete orienta- 

 tion at the first or second cleavage, or even before 

 cleavage, reflecting precociously the late organization; 

 as when the region of apical growth is represented by 

 conspicuous teloblasts, the fate of which is seen to be 

 definitely fixed from the moment of their appearance. 

 (Whitman.) 



Diffluence {dif'-lu-orz) [diMutre, to flow apart]. The 

 condition of being almost liquefied. 



Diffusate (dip '-//sat) [diffundtre, to spread by pour- 

 ing]. The portion of the liquid which passes through 

 the animal membrane in dialysis, and holds crystalloid 

 matter in solution. 



Diffusibility (d/f-u-si-bil'-il-e). Capacity for being 



diffused. D. of Gases, Dalton's term for that property 

 by which two or more gases confined in an enclosed 

 space expand as if the space were occupied by one gas 

 alone, the elastic force of the mixture being equal to 

 the sum of the elastic forces of all the combined gases. 



Diffusiometer {difu-ze-om' -et-i/r) [diffusion; fikrpov, 

 a measure]. A device for estimating the diffusibility 

 of gases. 



Difluordiphenyl, Difluorodiphenyl (di-fli/-or-di-fen f - 

 il, -o-di-fen'-il). C 6 H 4 F1 — C 6 H 4 F1. A white, crystal- 

 line, aromatic powder, freely soluble in alcohol, ether, 

 and chloroform ; insoluble in water ; specific gravity 

 of 1.04 and melting at 86° C. It is used as a \o c / c 

 dusting-powder or as a 10^ ointment in treating luetic 

 ulcers, etc. 



Digenetic (di-jen-et'-ik) [rf/c, two; -/ivecig, generation]. 

 Relating to alternate generation. 



Digenism (di'-jen-izii/). 1. See Digenesis (Illus. 

 Diet.). 2. The combined or concurrent action of two 

 causes. 



Digester (di-jest'-t/r) [digerere, to digest]. An auto- 

 clave or apparatus for destructive distillation. 



Digital. (See Illus. Diet.) 2. Performed with the 

 fingers. 3. Resembling a depression made with a 

 finger-tip ; e. g. , digital fossa. 



Digitalacrin idij-it-al-a'-krin). C 25 H 46 6 . A sub- 

 stance isolated by Walz from digitalis. 



Digitalein. (See Illus. Diet.) 2. A yellowish-white, 

 intensely bitter powder soluble in water and alcohol; 

 it is a cardiac tonic and diuretic. Dose, fa-fa gr- 

 (0.001-0.002 gm.) two to four times daily. 



Digitaletin (di/-it-al-el / -in). C 22 H 3g 9 . A substance 

 obtained from digitalin by heating with dilute acid. 



Digitaliform (di/'-it-aP-e-form) [digitus, a finger; forma, 

 form]. Finger-shaped. 



Digitalin, Digitalinum. (See Illus. Diet.) D., Crys- 

 tallized. See Digitin. D., French, a yellowish, 

 odorless, bitter powder, soluble in alcohol, chloroform, 

 and in 2000 parts of water, and said to consist of digi- 

 talin with some digitoxin. It is used as a heart tonic. 

 Dose, -n\-r gr. (0.00026 gm.) rapidly increased to fa 

 gr. (0.0015 gm.) daily. Max. dose, fa gr. (0.0015 

 gm.) daily. Syn., £>., Insoluble; D.. Chloroformic ; 

 £>., HomoUe's Amorphous. D., German, a white or 

 yellowish powder, soluble in water or alcohol, almost 

 insoluble in ether and chloroform, and said to consist 

 of digitalein with some digitonin and digitalin. It is 

 a noncumulative heart tonic and diuretic. 1 >ose, 

 fa gr. (0.001-O.002 gm. ) 3 or 4 times daily in pills or 

 subcutaneously. Max. dose, ^ s gr. (0.004 S m - ) 

 single, I gr. (0.022 gm. ) daily. Antidotes, emetics, 

 tannic acid, saponin, nitroglycerin, morphin early, 

 strophanthin later, alcoholic stimulants, etc. D., 

 Homolle's, D., Insoluble. See D. , French. D.- 

 Kiliani, a white, amorphous powder, soluble in 1000 

 parts of water and in 100 parts of dilute alcohol, and 

 exerting the characteristic effect of digitalis leaves. 

 Dose, j^jj gr. (0.00025 gm.). Syn., Digitalinum 

 verum Kiliani, D., Nativelle's, D.-Nativelle, 

 C 25 H 40 O, 5 , fine crystalline needles almost insoluble in 

 water, soluble in alcohol, said to consist chiefly of digi- 

 toxin. It is recommended as a heart tonic anil in treat- 

 ment of pulmonary inflammation. Dose, ,,',„ ■,.,', sl r - 

 (0.00065-0.001 gm.). D., Soluble. See £>., Ger- 

 man. 



Digitaliretin, Digitalirrhetin (dij-it-al-i-ret ' '-»«). C ]fi - 

 H, i6 0.,. A substance obtained by Walz from digitalin 

 by action of dilute acid with heat. 



Digitalism, Digitalismus (dij'-it-al-izin, dij-it-al-iz'- 

 mus). Poisoning through cumulative action of Dig- 

 italis purpurea, I.., used medicinally, consisting in 

 paralysis of cardiac action. 



