DIGITIGRADE 



375 



DIOPTOMETRY 



some hysterical women, and in certain types of insan- 

 ity. It is a manifestation of some vasomotor disorder. 



Digitigrade (dif '-it-ig-rad) [digitus, finger ; gradi, to 

 walk]. In biology, walking on the toes. 



Digitonin (dij-it-o-nin'} [digitalis, pertaining to the 

 ringers], C S1 H 52 17 . A white, amorphous mass ob- 

 tained from digitalis. It is easily soluble in water, 

 slightly so in alcohol ; insoluble in ether and chloro- 

 form. 



Digitoxin (dij-it-oks* -in) {digitalis, pertaining to the 

 fingers; toxicum, poison], CXjHjjOj, or CjjH^Oj^. A 

 highly poisonous alkaloid from Digitalis purpurea. Its 

 effects are little understood. Its action is cumulative. 

 Unof. 



Digitule (dig / -it-til) [digitulus, a little digit]. A little 

 finger, toe, or claw ; a small organ or prominence 

 resembling a digit. 



Digitus (dij'-it-us) [L.]. A finger or toe. 



Diglossia (di-glos* -e-ah) [dig , double ; y'/Axrca, tongue]. 

 The condition of having a double tongue. 



Digoneutic (di-go-nu' -tik) [dig, two; y&vog, offspring]. 

 In biology, producing two broods a year. 



Digonoporous (di-go-nop / -or-us) [dig, two ; y6vog, off- 

 spring; -opog, pore]. In biology, having the genital 

 pores separate. 



Digyn (di'-jin) [dig, two; ywr), woman]. In biology, 

 having two pistils. 



lydrolutidin (di-hi-drolu' '-tid-in) [dig, double ; 

 vdup, water], C 7 H n X. One of the alkaloids of cod- 

 liver oil. See Morrhuolins. 



lysteria {di-his-W -re-ali) [dig, double ; vcrepa, the 

 womb]. The presence of a double womb. 



iceratio cataractae (di-las-er-a' '-she-o kat-ar-ak / -te) 

 [L.]. See Dilaceration. 



iceration (di-las-er-a' '-shun) [dilaceratio, a tearing 

 apart] . A tearing apart ; division of a membranous 

 cataract by a tearing operation. 

 Jilatatio cordis (di-lat-a' -she-o kor'-dis) [L.]. Dila- 

 tation of the heart. 



nation (di-lat-a f -shun) [dilatare, to spread out]. I . 

 An increase in the size of a cavity or of the lumen of a 

 vessel ; expansion of an organ without hypertrophy. 

 2. Surgical stretching out of the walls of a hollow 

 organ. D. of Blood-vessel. See Telangiectasis. 

 D. of Heart, an increase in the size of one or more of 

 the cavities of the heart, arising from a relaxation or 

 weakening of the heart-muscle. It is associated with 

 evidences of failure of circulation, resulting in conges- 

 tion of the lungs and other viscera and tissues, 

 itator (di-lat-a' '-for). See Dilator. 

 itor (di-la'-tor) [dilatare, to spread out]. An instru- 

 ment for stretching or enlarging a cavity or opening ; 

 also, a dilating muscle. See Muscles, Table of. D., 

 Barnes', an instrument for dilatation of the os and cer- 

 vix uteri, consisting of a rubber bag, which, when in- 

 serted, is distended with water. D., Intrauterine, 

 for dilating the uterine cavity by means of air or water. 

 D., Laryngeal, an instrument with two or three blades 

 that may be separated, for freeing or dilating the larynx, 

 lemma (di-lem' '-ah) [di/jjfiua ; dig, double ; /.fjtifia, 

 proposition]. In experiments to determine the reac- 

 tion-time of psychic processes, if the person is told 

 which side is to be stimulated, or what colored disc is 

 to be presented, etc. , the time is shorter. Lack of such 

 foreknowledge is called the dilemma. 

 )ill .HI). See Anethum. 

 )ilmaisch Disease. See Disease. 



>iluent (dil'-u-enf) [diluere, to wash away]. An agent 



that dilutes the secretions of an organ, or that increases 



the fluidity of secretions. 



>ilution (di-lu' -shun) [diluere, to wash away]. I. The 



process of mixing with a neutral fluid or substance, in 



order to attenuate. 2. A diluted substance ; the result 

 of a diluting process. 



Dilutionist (di-lu' '-shun-ist) [diluere, to wash away]. 

 One who advocates the dilution of medicines. D., 

 High, a homeopathist who advocates the extreme at- 

 tenuation of medicines. 



Dimerosomatous (dim-er-o-som' -at-us) [dig, two ; fii - 

 pog, a part; octua, body]. In biology, applied to 

 animals, as spiders, that have the body divided into 

 two regions, cephalo-thorax and abdomen. 



Dimerous (dim'-er-us) [dig, two; pipog, a part]. In 

 biology, bipartite. 



Dimethyl Ketone. See Acetone. 



Dimethylamin (di-meth-W '-am-in) [dig, two ; methyl, 

 arnin~\, XC„H T . Anon-toxic ptomaine found in putre- 

 fying gelatin, old decomposing yeast, certain varieties 

 of fish-decomposition, etc. 



Dimethylarsin (di-meth-il-ar 1 '-sin). See Cacodyl. 



Dimethylphenylene-green. See Pigments, Conspec- 

 tus of. 



Dimetria (di-me / -tre-ah) [dig, double ; fdj-pa, the 

 womb]. The condition of having a double womb. 



Dimidiate (di-mid' '-eat) [di, apart; medius, middle]. 

 In biology, divided into halves, or represented by one 

 half only ; one-sided. Applied to an anther whose 

 lobes are widely separated by a broad connective, or 

 to animals that are male on one side and female on 

 the other. 



Diminished Breathing. See Breath-sounds. 



Dimorphism (di-morf -izm) [dig, double ; imperii, form]. 

 The property of assuming or of existing under two 

 distinct forms. 



Dimorphous (di-morf f -us) [dig, double ; uopoij, form]. 

 In chemistry, having the quality of two forms of 

 crystallization. In biology, existing in two forms, 

 as individuals of the same species that differ in 

 form, structure, size, or color. 



Dimple (dim 1 -pi) [AS., dynt]. A slight depression. 



Dingee (din f -ge). Synonym of Dengue. 



Dingler's Green. See Pigments, Conspectus of . 



Dinic, Dinical (din'-ik, or din f -ikal) [divog, whirl]. 

 Pertaining to or useful in the relief of vertigo. 



Dinitrobenzene (di-ni-tro-ben 1 '-zen) [di, two ; nitrum, 

 niter; benzene], C 6 H 4 (XOj) r One of the ingredients 

 of Roburite, q. z: 



Dinner Pills. A name applied to various mild cathartic 

 pills taken after meals. See Lady Webster Pill. 



Dinomania (din-o-ma' '-ne-ah) [divog, a whirling dance ; 

 fiavia, mania] . Dancing-mania. Choromania, q. v. 



Dinus (di'-nus) [divog, whirl]. Vertigo or dizziness. 



Dioecious (di-e'-shus). See Diecious. 



Diogenes' Cup. See Poculum diogenis. 



Diogmus (di-og'-mus) [dujyfidg, a chase]. Palpitation 

 of the heart. 



Dionaea (di-o-ne'-ah) [\idvt], Dione]. A genus of 

 plants. D. muscipula, a plant of the Sundew family, 

 growing in the Carolinas ; Venus's fly-trap. It cap- 

 tures and feeds upon various insects, and is said to 

 contain droserin and azerin, the same digestive fer- 

 ments that occur in Drosera, q.v. Unof. 



Dionym (di'-o-nim) [dig, two; ovv/ta, name]. A name 

 consisting of two words, as medulla oblongata ; corpus 

 callosum. 



Diophthalmus (di-off-thal' -mus). See Diprosopus. 



Diopsimeter (di-op-sim' '-et-er) [dio^ig, clear vision ; 

 fierpov, a measure]. An instrument for exploration of 

 the visual field. 



Diopter (di-op f -ter). See Dioptry. 



Dioptometer (di-op-tom' '-et-erj. Same as Optometer. 



Dioptometry (di-oMom' -et-re) [dioTrri/p, a watchman ; 

 fikrpav, a measure]. The measurement of the accom- 

 modative and refractive states of the eye. 



