XEROPHVTE 



569 



ZINC 



Xerophyte [zer'-o-flt) [$rjpos, dry; tvrov, plant]. A 

 plant indigenous to arid regions. 



Xerosis. (See Illus. Diet. ) X. epithelialis, X. in- 

 fantilis, X. triangularis, is marked by lusterless, 

 grayish-white, foamy, greasy, very persistent deposit 

 on the conjunctiva. 



Xiphodynia <zif-o-din'-e-ah) [iVoor, sword; odi-vr/, 

 pain]. Pain in the ensiform cartilage. 



Xiphopagism fzif-op / -a-gizm) [^ooc, sword; rrdyoc, 

 fixed]. The state or condition of a xiphopagus. 



Xiphisternal. See Xiphisternal (Illus. Diet). 



Xiphosternum. See Xiphisternum (Illus. Diet). 



X-leg. Genu valgum. 



X-ray Photography. Synonym of Skiagraphy. 



Xylan >:i'-/an). A furfuroid occurring abundantly in 

 straw and manure ; when hydrolyzed to xylose it fur- 

 nishes the most natural and favorable carbohydrate 

 food for denitrifying organising 



Xylene <zi'-le>n. See Xylol (Illus. Diet.). 



Xylenin, Xylenobacillin. See Zylenin, Zylenobacillin. 



Xylochloral {zi-lo-klo f -ral). A crystalline compound 

 of xylose and chloral, prepared by heating with hydro- 

 chloric acid ; soluble in water, melts at 132 C. It is 

 used as a hypnotic. 



Yaba Bark. The bark of Andira excelsa. H. B. K. 



Yccotli /<••'-.: . See Thezetia yccotli, D. C. 



Yeast. See Illus. Diet. ) Y., Chinese, a zygomycete 

 .vlomyces rouxii) which possesses not only an asex- 

 ual method of reproduction, but forms spores on the 

 mycelial filaments ; they are carried at the ends of the 

 filaments, the mode of production being similar to that 

 in J/ucor. Y. -therapy. See Yeast-treatment under 

 Treatment. 



Yellow. (See Illus. Diet.) Y. Fever in Ireland 

 tores). Synonym of Relapsing fever. Y. -seeing, 

 Y. Visi»n. See Xanthopsia (Illus. Diet). 



Yohimbe or Yohimbehe Bark. The bark of 



Corynanthe yohimbe, K. Schumann, order Rubiacea, 

 a tree of the Cameroon region. 



Yohimbin (yo-hin/-bin). A mixture of alkaloids from 

 the bark of Corynanthe yohimbe, K. Schumann; used 

 as an aphrodisiac. Dose, ^^-\ gr. 3 times daily and 

 as a local anesthetic in I ^ solution. 



Yolk. (See Illus. Diet) Y.-nucleus. See under 

 Xucleus. Y. -platelets, bodies found in the eggs of 

 certain fishes ; they consist of albumins, lecithins, and 

 mineral salts, and apparently possess a crystalline struc- 

 ture. Y. -stalk, the umbilical duct. 



Yttria (it'-tre-ah). Yttrium oxid. 



Yttriferous {it-rif'-ur-us) \jltrium ; ferre, to bear]. 

 Yielding yttrium. 



Zaharbad [East Indian blood poison]. Yemacular for 

 trypanosomiasis. 



Zakavaska. The name given in Russia to the grains 

 used as a ferment to produce kephyr or kumiss. 



Zaleski's Hepatin. See Ferratin of Schmiedeberg. 



Zanzolin. Zanzolina (zanf-zol-in, zan-tol-r'-mih). A 

 proprietary mixture of pyrethrum flowers, Chrysanthe- 

 mum coronopi folium, Wilid., and valerian root, Valer- 

 iana officinalis, L. ; used to combat mosquitoes. 



Zapota Gum. See Balata (Illus. Diet). 



Zean z.'-an) \Zea, a genus of grasses]. A highly 

 concentrated extract of corn silk ; a diuretic and urin- 

 ary antiseptic. 



Zematone (zem'-aton). A proprietary remedy for 

 asthma said to consist of extractives of Datura stra- 

 monium, L., Hyoscyamus niger, L., each 8 parts; 

 G indelia robusta, Nutt, 15 parts; Solanum nigrum, 

 I... 4 parts; Atropa belladonna, L., 6 parts; white 

 agaric, 5 parts ; poppy capsules, 5 parts ; and potas- 

 sium nitrate, 22 parts. 



Zero. (See Illus. Diet.) Z., Absolute, the point at 

 which thermic energy is not liberated, — 273. i° C. 



Zerquoun minium | zur-inco'-un min'-c-ttm). An Ori- 

 ental medicine used as a substitute for red oxid of mer- 

 cury, but when analyzed by Guignes was found to be 

 magnesium silicate colored with a coal-tar dye. 



Zestocausis {zes-to-kav/ -sis) [Cfffrdc, boiling hot; 

 Kavmc, a burning]. See Atmocausis. 



Zestocautery izes-to-kan' '-ter-c). A double channeled 

 intrauterine catheter, the outer unfenestrated tube of 

 which is heated by steam and acts as a cautery. C£ 

 Atmocautery. 



Zherbad [East Indian poison wind or miasma]. Yer- 

 nacular for trypanosomiasis. 



Zinc. (See Illus. Diet) Z. Biborate, Z. Borate. 

 See Z. Tetraborate. Z. Bromate, Zn! BrO,), + 6H.O, 

 a white antiseptic powder, soluble in water or ammo- 

 nia. Z. Bromid, ZnBr., white powder with sharp 

 metallic taste, soluble in water, alcohol, ether, or am- 

 monia; used internally in epilepsy in dilute solution. 

 Dose, 1-2 gr. ; max. dose, 10 gr. daily. Z. Carbo- 

 late, white antiseptic powder slightly soluble in water 

 or alcohol ; used as a surgical dusting- powder. Z. 

 Chrysophanate, brown powder soluble in alkaline so- 

 lutions ; used as a dressing for wounds. Z. Cyanid, 

 Zn(CNij, white, poisonous, crystalline powder; used 

 in chorea, gastralgia, etc. Dose, 7*5- 'i -1 g 1 - (0.006- 

 0016-0.065 gm.). Antidotes, ammonia, a mixture 

 of iron protosulfate and persulfate. inhalation of 

 chlorin. etc. Z. -ethyl, Zni C.H S 1... ■ reaction product 

 of zinc and zinc-sodium with ethyl iodid : a very dan- 

 gerous colorless liquid which takes fire in contact with 



