DUPLICATION 



401 



DYNE 



Duplication (du-plik-a' 'shun). Same as Reduplication, 

 q. V. 



Duplicature (du' ' -plik-a-chur) [duphcare, to double]. 

 The reflection, or folding of a membrane upon itself. 



Duplicity (du-plis'-it-e) [duplicitas, doubleness]. The 

 condition of being duplex or double. 



Dupuytren's Contraction. See Diseases, Table of. 

 D. Hydrocele. See Diseases, Table of. D. Oint- 

 ment, an ointment used to correct baldness. It con- 

 tains ox-marrow 250, lead acetate 4, balsam of Peru 

 8, diluted alcohol 30, tinct. of camphor, \% » tinct. 

 of cloves and tinct. of cinnamon, each I. D. Opera- 

 tion. See Operations, Table of. D. Splint, a splint 

 used in the treatment of Pott's fracture of the leg. 

 D. Suture. See Suture. 



Dura (du'-rah) [durus, hard]. The Dura mater, q. v. 

 D. mater, the outer membrane of the brain and spinal 

 cord. It is divided into the cerebral and spinal or 

 rhachidian dura, and its cerebral portion is in part 

 identical with the endocranium. D. m. testis, the 

 tunica albuginea of the testis. 



Duraematoma (dur-em-at-o' -mah). See Durematoma. 



Dural (du'-ral) [durus, hard]. Pertaining to the dura. 



Duramen (dur / -am-en) [durare, to harden]. In biology, 

 heart- wood. 



Durande's Solvent. A solvent for biliary calculi ; it 

 consists of three parts of ether and two of turpentine, 

 linistered in capsules immediately before meals. 

 Treatment. See Treatment, Methods of. 

 ration (du-ra' '-shun) [durare, to last]. Continuance 

 time. D. of Life, several methods of ascertain- 

 the duration of life are employed: I. The Mean 

 Ige at Death ; 2. the Probable Duration of Life ; 3. 

 le Mean Duration of Life; 4. the Expectation of 

 jfe, or mean after-lifetime ; and 5. the number living 

 out of which one dies annually. According to the 

 English Life-table No. 3, the mean age at death is 

 40. 9 years , but this test is, for several reasons, fallacious , 

 though it is of exceptional interest when the deaths 

 from various diseases are considered. See Probable 

 D. of L., Expectation of Life, and Life-table. 



Durematoma {dur-em-at-o 1 -mah) [dura, hard ; diua, 

 blood; bun, tumor: pi. , Durematomata"]. Hematoma 

 of the dura; an accumulation of blood between the 

 dura and arachnoid. 



Durene (du'-ren) [durus, hard] C, H U . A hydrocar- 

 bon, present in coal-tar. It is a crystalline substance 

 that possesses a camphor-like odor ; it melts at 79-S0 



C, and boils at 190 C. 



Diirer. Angle of. See Angle. D., Plane of. See Plane. 



Durham's Tube. The lobster-tail tube largely used 

 in tracheotomy. 



Durilic Acid (du-ril'-ik). See Acid, Durilic. 



Duro-arachnitis (du f -ro-ar-ak-ni' -tis) [durus, hard ; 

 apaxvr], a spider ; iric, inflammation]. Inflammation 

 of the dura and arachnoid membrane. 



Duroziez' Murmur. See Signs and Symptoms, Ta- 

 ble of 



Dusart-Blondlot's Test. See Tests, Table of. 



Dust-occupations. Those that from the nature of 

 the particles of the dust produced may give rise to 

 pneumoconiosis, tuberculosis, or bronchitis. 



Dutch (duck) [ME., Dutche\ Pertaining to Holland. 



D. Bitters. See Latifa. D. Gold, an alloy of 

 copper and zinc. D. Liquid. See Ethene Chlorid. 

 D. Mineral, copper beaten out into very thin leaves. 

 D. White. Same as Hamburg IVhite. 



Duval's Operation. See Operations, Table of. 



-iii Verger, Suture of. See Suture. D. Method. 



Operations. Table of. 

 Duverney, Foramen of. See Foramina, Table of. D. 

 Glands. See Gland. 



Dware's Test. See Tests, Table of. 



Dwarf (dworf) [ME., dwarf]. A being characterized 

 by completed physical development, but having the 

 various parts of unnaturally small dimensions, owing 

 to insufficient growth. This condition is frequently 

 associated with sterility and impotence. See A'anism, 

 Mams. D. Elder, the Aralia hispidia. Its root 

 is a valuable diuretic. Dose of fld. ext. 3J-1J. Unof. 

 D. Tape -worm. See Tcenia nana. 



Dyad (di'-ad). See Quantivalence. 



Dyaster (di-as'-ter) [&ic, two ; donyp, star]. In biology, 

 the karyokinetic figure assumed by the aster of a divid- 

 ing nucleus before the formation of the stars at the 

 ends of the nuclear spindle. It is the sixth stage of 

 Karyokinesis. 



Dye (di) [ME., dyen, to dye]. To color a substance 

 by immersing it in some coloring-matter. The ma- 

 terial used as a coloring-substance. D.- stuffs. See 

 Pigments, Colors, and Dye-stuffs. 



Dyer's Broom. See Pigments, Conspectus of. 



Dyerism (di'-er-izm) [Dyer, the physician who proposed 

 it]. A simple means of giving exercise to all the 

 ocular muscles at once. It consists merely in reading 

 a certain definite small amount daily, and increasing 

 that amount systematically as the strength of the eyes 

 increases. 



Dyerizing (di'-er-lz-ing). See Dyerism. 



Dynam (di'-nam). See Dyne. 



Dynamia (di-na'-me-ah) [diva/ug, power]. I. Ability 

 to resist diseases, or to withstand the effects of any 

 strain, physical or mental. 2. The sthenic character 

 of any attack of disease. 



Dynamic (di-nam' -ik) [Swa/iic, energy]. Pertaining to 

 energy. In medicine, a synonym of Sthenic, q.v. D. 

 Squint. See Insufficiency. 



Dynamics (di-nam' -iks). See Mechanics. 



Dynamite (di'-nam-it) [dvvauic, power]. An explo- 

 sive consisting of nitroglycerin incorporated with in- 

 fusorial earth, to give it consistency. It is eight times 

 as powerful as gunpowder. 



Dynamization (di-nam-iz-a'-shun) [Svvautg, power]. 

 The so-called potentizing of medicines by comminu- 

 tion and agitation. 



Dynamo (di'-nam-o) [Svvafuc, power]. A dynamo- 

 electric machine ; a machine that generates dynamic, 

 or current electricity, instead of static electricity ; one 

 in which the current is generated by revolving coiis 

 of insulated wire through the field of a magnet inten- 

 sified by the same current. 



Dynamogeny (di-nam-of -en-e) [61-vafug, energy ; j e 1- 

 vdi» > to beget]. The production of energy ; the phys- 

 iologic generation of force. 



Dynamograph (di-nam' -o-graf) [di-va/itc, power ; ypd- 

 <j>eiv, to write]. An instrument designed to measure 

 and graphically record muscular strength. 



Dynamometer (di-nam-om' '-et-er) [divafiic, power ; 

 ftirpov, a measure]. An instrument designed to 



II 



Dynamometer of Mathieu. (Landois.) 



measure force, or one for the measurement of muscu- 

 lar strength, particularly of the hand. 

 Dyne (din) [diva/or, power]. A force sufficient to 



