DIPTEROCARPUS 



378 



DISEASE 



Dipterocarpus {dip-ter-o-kar f -pus) [dirr-epog, two- 

 winged; Kapwdg, fruit]. A genus of trees, mostly S. 

 Asiatic. D. alatus, D. costatus, D. hispidus, D. l<zvis, 

 and D. zeylanicus afford wood-oil or gurjun balsam. 



Dipterous (dip' -ter-us) [dig, two ; Trrspdv, wing] . In 

 biology, two- winged, as a fly or a seed. 



Dipteryx (dip f -ter-iks) [dig, two; mepv^, a wing]. A 

 genus of leguminous trees. D. odorata, the tree that 

 produces the Tonka Bean, q. v.. 



Dipygus {dip'-ig-us) [dig, double ; irvy?/, buttocks] . A 

 monstrosity with more or less duplication of the pelvis 

 and lower parts of the back. 



Dirca {der'-kah) [Aipur/, a fountain near Thebes]. A 

 genus of apetalous shrubs. D. palustris, wicopy, 

 leatherwood, or moosewood ; a N. American thyme- 

 laceous shrub, with the properties of mezereon. It is 

 sparingly used in domestic practice for dyspepsia and 

 hemicrania. Unof. 



Direct {di-rekt') \_directus, straight]. In a right or 

 straight line. D. Current. See Current. D., 

 Image. See Image. D. Ophthalmoscopy. See 

 Ophthalmoscopy. D. Vision, the perception of an 

 object the image of which falls upon the maculae. 



Direction (di-rek' '-shun) [dirigere, to direct]. Rela- 

 tive position considered without regard to linear dis- 

 tance. D. -spindle, a fusiform body of the ovula, 

 stretching from the germinal vesicle toward the surface. 



Director {di-rek' '-tor) [dirigere, to guide]. Anything 

 that guides or directs. D., Grooved, an instrument 

 grooved to guide the knife in surgical operations. 



Dirigomotor (dir-ig-o-mo'-tor) [dirigere, to direct; 

 motor, a mover] . Causing or involving motion and 

 at the same time directing that motion to an end. 



Dirt [dert) [ME., drit\ Excrement; feces. D. -eat- 

 ing. See Chthonophagia and Geophagism. 



Dis [dig, twice]. A prefix used to denote two or 

 double. Also, a prefix to denote apart from. 



Disaccharids (di-sak'-ar-ids). See Carbohydrates. 



Disarthral {dis-ar' '-thral) [dig, twice; apOpov, a joint]. 

 Relating to muscles that pass over two joints, e.g. , the 

 biceps. 



Disarticulation {dis-ar-tik-u-la'-shun) [dis, apart; 

 articulum, a joint]. Amputation in the contiguity 

 of a part or at a joint. 



Disassimilation {dis-as-sim-il-a' -shun) \jdisassimilatio~\ . 

 In ophthalmology, the decomposition of visual sub- 

 stances in the retina. 



Disassociation (dis-as-o-se-a / -shun) [dis, apart ; asso- 

 ciare, to unite with]. In chemistry, the decomposi- 

 tion of a compound by heat, the molecules reuniting 

 on the removal of the heat. 



Disc (disk) [discus, dioKor, a quoit or round plate] . A cir- 

 cular, plate-like organ or body, especially the papilla of 

 the eye, the entrance of the optic nerve into the eye- 

 ball. Its area corresponds with that of the blind spot. 

 In dentistry, an instrument in the form of a disc, 

 made of emery, cuttle-fish, bone, or sand-paper, for fin- 

 ishing fillings on surfaces between teeth. D., Blood. 

 Sec Blood-corpuscle. D. -carrier, an instrument ap- 

 plied to the dental engine for the better application 

 of corundum discs to the teeth. D., Choked. See 

 Papillitis. D., Corundum. A device used in den- 

 tistry for separating teeth, by cutting away a portion ; 

 it is used with the dental engine, and applied by means 

 of carriers, that admit of ready adjustment and 

 change of the disc to any desired angle with the shaft 

 containing it. D., Cupping of. See Exca7>ation 

 of the Optic Nerve. D., Germinal, the small disc 

 of the blastodermic membrane, in which the first 

 traces of the embryo are seen. D., Hypermetropic, 

 hazy ; simulating optic neuritis, observed in hyperme- 

 tropia. D., Proligerous. See Discus proligerus. 



Discharge (dis-char/) [ME., dischargen, to unload]. 

 Any evacuation ; that which is evacuated. See also 

 Pigments, Colors and Dyestuffs. 



Discharger (dis-char' -jer). See Electric. 



Discharging (dis-charj' -ing) [ME., dischargen, to un- 

 load]. Unloading, flowing out, as pus, etc. D. 

 Centers, nerve-centers whence emanate influences 

 which, according to the structures at the other ends 

 of the nerves connected with them, may cause move- 

 ments (muscles), secretion (glands), or contraction of 

 vessels. D. Lesion, a brain-lesion that causes sudden 

 discharges of nervous motor influence. 



Disciferous (dis-if '-er-us)[discus, a disc ;ferre, to bear]. 

 In biology, disc-bearing. 



Discifloral (dis'-iflo-ral) [discus, a disc ; flos {for), a 

 flower]. In biology, applied to such flowers as have 

 the receptacle expanded into a conspicuous disc. 



Discissio cataractae. See Discission. 



Discission {dis-ish' '-un) [discissio ; discindere, to tear or 

 cut apart]. 1. Bilateral incision, as of the cervix 

 uteri. 2. An operation for cataract. See Cataract. 



Discoblastula (dis-ko-blas' -Ui-lah) [dicnog, a disc ; 

 j3Aaar6g, a germ]. In embryology, the blastula result- 

 ing from the development of a discomorula. 



Discocarp (dis f -ko-karp) [dicnog, a disc ; Kapwdg, a 

 fruit]. In biology, applied to those fruits in which 

 the expanded receptacle encloses the seeds or achenia ; 

 also the same as Apothecium. 



Discocytula {dis-ko-sit' -u-lah) [dicnoc,, a disc ; nvrog, a. 

 cell]. In embryology, the cytula resulting from the 

 reformation of a nucleus in a discomonerula. 



Discodactyl {dis-ko-dak' '-til) [dicnog , a disc ; da.KTv7iog, 

 a finger]. In biology, applied to those animals (e.g. , 

 toads and frogs) the ends of whose toes are provided 

 with disc-like dilatations. 



Discogastrula {dis-ko-gas'-tru-lah) [dicnog, a disc; 

 yacrr/p, belly ; gastrule, a two-layered germ-cup]. The 

 gastrula resulting from discoid egg-cleavage or discoid 

 segmentation of the yolk. 



Discoid or Discoidal (dis'-koid, dis-koi' -dal) [dicnog, a 

 disc]. Somewhat disc-shaped. 



Discomonerula {dis-ko-mo-ner' -u-lah) [dicnog, disc ; 

 fiovi/pqg, solitary]. In embryology, a disc-like 

 monerula of a meroblastic ovum. 



Discomorula(</w-/Y>-;w<i>/- / -//'-/W^) [dicnog , a disc ; morula, 

 dim. of morum,2L mulberry]. In embryology, a disc- 

 like morula of a meroblastic ovum. 



Discrete (dis-kref) [discretus, separated]. A term 

 applied to exanthematous eruptions in which the 

 pustules or papules remain distinct. The opposite of 

 confluent. 



Discus {dis'-kus) [6'aicog, a disc]. A disc. D. prolig- 

 erus, the elevated cells of the mcmbrana granulosa of 

 the ovum, whereby the ovum is attached. 



Discussion [dis-kush' -uri) [discussio']. The scattering 

 or driving away of a swelling, effusion, or tumor. 



Discutient {dis-ku'-shenf) [discutere, to shake apart]. 

 I. Capable of effecting resolution or discussion. 2. 

 A medicine supposed to have the power of scatter 

 ing or discussing a swelling. 



Disdiaclast (dis-di'-ak-last) [dig, double ; 61a, through ; 

 n'Meiv, to break down]. Any one of the (supposed) 

 small doubly-refractive elements in the contractile 

 discs changing its position during muscular contrac- 

 tion and relaxation. 



Disease (dis-cz') [dis negative; case, a state of rest]. 

 A condition of the body marked by inharmonioui 

 action of one or more of the various organs. o\\ 'ing to 

 abnormal condition or structural change. A Table of 

 Diseases named after men who have described or have 

 especially studied them is appended. D., Acute, a 

 disease marked by rapid onset and course. D., Bad, 



