DELITESCENCE 359 



great exhaustion, distressing illusions and 

 lallucinations. D. vigilans. See D. tremens. 



Delitescence (del-it-es' -ens) [delitescere, to lie hid]. 

 The sudden disappearance of inn animation by resolu- 

 tion. Also, the. period of incubation of the virus of 

 contagious diseases, such as smallpox, etc. 



Delivery {de-lit/ -er-e) [Fr., delivrer ; deliberare, to set 

 free]. Parturition, childbirth. D., Post-mortem, 

 the birth of a fetus after the death of the mother, 

 from an accumulation of gases in the uterine cavity. 



Delomoiphous (del-o-mor 1 -/us) [drj/joc, conspicuous; 

 rm]. With open or conspicuous form. D. 

 Cells of Rollet, collections of large, oval, or angular, 

 well-defined, granular, reticulated, nucleated cells, 

 between the membrana propria and the adelomorphous 

 cells of the fundus glands of the gastric mucous mem- 

 brane. They are called, also, Parietal Cells of 

 Heidenhain, or Oxyntic Cells of Langley. The 

 secretory part of the tubes is lined by cells called 

 Adelomorphous. Central, or Principal Cells. 



Delore's Operation. See Operations, Table of. 



Delpech's Operations. See Operations, Table of. 



Delphin {del' -fin). Same as Delphinin. 



Delphini Oleum (del-fi' -ni o / -le-um) [L.]. The oil of 

 the common porpoise, Phoccena communis. It is said 

 to have all the medicinal virtues of cod-liver oil, 

 hoot the disagreeable qualities of the latter. 



Deiphinin (del' -fin-in) [dc/joivtov, larkspur], C 24 H 35 - 

 NO,. A poisonous alkaloid from Staphisagria. See 

 Staphisagria. 



Delphinium (del-fin' -e-um). See Staphisagria. 



Delphinoidin (del-fin-oid'-in) [Se'/joiviov , larkspur; 



i etSoc, like]. An amorphous alkaloid derived from 



DENDRITIC 



Delphisin i del'-fis-in) [Se?jpiviov, larkspur], C^H^NjOg. 



An alkaloid of Stavesacre occurring in crystalline tufts. 



Delta (del'-tah) [di/.ra, the fourth letter of the Greek 



I alphabet]. The vulva, from its triangular shape. D. 

 mesoscapulae, the triangular area at the root of the 

 spine of the scapula. 

 Deltidium (del-tid'-e-um) [the Greek letter A, 6e/.to]. 

 In biology, applied to the triangular space on a brach- 

 iopod shell, between the beak and the hinge. 



Deltoid M'-toid) [delta, the Greek letter A; eldoq, 

 likeness]. Having the shape of a delta, or a triangular 

 form, as the D. Muscle. See Muscles, Table of. 



Delusion \de-lu'-zhiai) [de, from; lusus, play]. A 

 false judgment of objective things, as distinguished 

 from illusion and hallucination. It is the result of an 

 abnormal condition of the brain. A delusion may be 

 systematized or unsystematized, the former being the 

 more serious and met with in the chronically insane. 



delusional (de-lu' -zhun-al) [deludere, to delude]. Of 

 ature of a delusion ; characterized by delusions. 

 D. Stupor. See Insanity, Confusional. 



demarcation (de-mar k-a' -shun) [demarcare, to set the 



i bounds of]. A line of separation, as between gan- 



: grenous and healthy tissue. 



>emarquay's Operation. See Operations, Table of. 



demembration { de-mem-bra' -shun) [demembrare, to 

 deprive of a limb or limbs]. The cutting off of a 

 member ; amputation ; castration. 



>ement ie'-ment) [demens, insane]. An insane per- 



one who is demented. 

 >ementia (de-men' -she-ah) [de, out of; mens, the 

 mind]. A mild form of insanity marked by imper- 

 fect conception, illogical sequence of expression, loss 

 of reflection, and impaired perception. There is par- 

 tial loss of self-control and self-respect. Dementia is 

 often a final stage of other forms of insanity. It is 



■ described under the various forms of secondary, 

 senile, organic, and alcoholic. There is a general 



atrophy of the brain- substance, with a compensatory 

 thickening of the brain-membranes, and an increase 

 of the fluid of the brain and of the neuroglia. 



Demersal, or Demersed (de-mer 1 '-sal, or de-merst') 

 [demersus, plunge into]. In biology, growing beneath 

 the surface of water, as the eggs of the catfish. 



Demi- (dem'-e-). A Latin prefix denoting one-half. 



Demilune Cells [dem'-e-lun selz) [demiius, half; luna, 

 moon]. See Cell. D. C. of Adamkiewicz. A pecu- 

 liar form of nerve-corpuscle lying below the neuri- 

 lemma of medullated nerve-fibers ; it is stained yellow 

 by safranin. D. C. of Heidenhain, half-moon shaped 

 bodies lying between the cells and the membrana 

 propria of the alveolus in the salivary glands. 



Demimonstrosity yhni-c-mon-stros'-it-e) [demi, half; 

 monstruosus, monstrous]. A variety of congenital 

 deformity that does not give rise to appreciable dis- 

 order of function. 



Demme, Bacillus and Micrococcus of. See Bac- 

 teria, Synonymatic Table of. 



Demnia (dem'-ne-ah) [Aiuviov, a bed]. In biology, 

 the subgenital cavities found in the Discomedusa ; 

 they are also called respiratory cavities, genital cavi- 

 ties, umbrella-cavities of the reproductive organs ; 

 infundibula subgenitalia . 



Demodex (dem'-o-deks) [dqfibc, fat/ 6^, an insect]. 

 A genus of parasitic insects. D. folliculorum , a 

 minute parasite found in the sebaceous follicles, par- 

 ticularly of the face. It probably does not produce any 

 symptoms, though in large numbers it may produce 

 acne. See Comedo, also Parasites (Animal), Table of. 



Demography (de-mog'-ra-fe) [6^rjog, the people; 

 ypadeiv, to write]. The science of peoples collectively 

 considered ; social science, including that of vital sta- 

 tistics and the consideration of various questions of 

 state medicine. 



De Moivre's Hypothesis. An hypothesis that the de- 

 crements of population are in arithmetic proportion, 

 and that of every 86 persons born, one dies uniformly 

 every year until all are extinct. 



Demonolatry (de-mon-ol' -at-re) [Saiuup, a demon ; '/ar- 

 peia, worship] . Insane or delusional worship of devils ; 

 the morbid assumption of the character of a witch. 



Demonomania (de-mo-no-ma' -tu-ah) [fiaifiov, a devil; 

 fiav'ta, madness]. A form of madness in which a 

 person imagines himself possessed of a devil. 



Demonomaniac ( de-mo-no-ma' -ne-ak ) [ datuuv, a 

 devil ; uavia, madness]. One who suffers with demo- 

 nomania. 



Demonopathy (de-mon-ofr" -a-the) [ Saiuuv, a demon ; 

 ■xadoc, disease]. Same as Demonomania. 



Demonstrator (dem'-on-stra-tor) [demonstrare, to 

 show]. One who instructs in the practical application 

 of the arts and sciences. 



De Morgan's Operation. See Operations, Table of. 



Demours, Membrane of. See Descemet's Membrane. 



Demulcent (de-mul' -sent) [demulcere, to smooth]. 1 

 Soothing ; locally softening and lenitive. 2. Any 

 substance that protects the mucous membranes. It is 

 generally of a mucilaginous nature. 



Demutization (de-mu-tiz-a' -shun) [de, not; mtttus, 

 dumb]. The education of deaf-mutes to speak and 

 to understand spoken language by the movement of 

 the lips, signs, etc. 



Denan's Operation. See Operations, Table of. 



Denarcotized (de-nar'-Jto-fizd) [de, priv.; vapnurucbc, 

 narcotic]. Having the narcotin removed, as opium. 



Dendrite (den'-drtt) [fevdpov, a tree]. A protoplasmic 

 process of a nerve-cell. 



Dendritic, or Dendroid (den-drif -ik, or den'-droid) 

 [rfevdptVjyc ; devSpoeitii/c: ; 6iv6pov, a tree]. Tree-like or 

 arborescent. The arrangement of the structures that 



