HYALOIDITIS 



578 



HYDRANGIOLOGY 



surrounding the vitreous humor, except in front, 

 where it becomes fibrous and strong and forms a leaf- 

 let of the zonula of Zinn. 



Hyaloiditis (hi-al-oid-i' -tis) . See Hyalitis. 



Hyalonyxis (hi-al-o-niks' '-is) \ya\og, glass ; vv!-ig, a 

 pricking]. Puncture of the vitreous body of the eye. 



Hyalophagia (hi-al-o-fa' ' -je-ah) [yaAog, glass ; (payclv, 

 to eat]. The practice of eating glass, sometimes seen 

 among insane persons. 



Hyaloplasm (hi'-al-o-plazm) [vaAog, glass ; TTAao/ia, 

 plasm]. The clear, fluid, homogeneous portion of the 

 protoplasm surrounding the spongioplasm of a living 

 cell. The term is also used as a general synonym of 

 protoplasm. 



Hybrid (hi'-brid) \yfipig, insult]. The offspring of 

 two individuals of distinct but closely related species. 

 Among animals, the mule is the best known hybrid. 

 H. Measles. .Synonym of Rbtheln, q. v. 



Hybridism, or Hybridity (hi'-brid-izm, hi-brid'-it-e) 

 \_bjipig, insult]. Cross-breeding; mixture of races; 

 the combination of various diseases. 



Hybridization (hi-brid-iz-a' -shun) \hybrid, a mongrel ; 

 vSpig, insult]. Cross-breeding. 



Hydantoic Acid (hi-dan-to'-ik). See Acid, Glyco- 

 luric. 



Hydanto'in (hi-dan-to' '-in) , C 3 H 4 N 2 2 . Glycolyl urea. 

 A substance that crystallizes from hot water and from 

 alcohol in needles that melt at 206° C, and have a 

 neutral reaction and sweet taste. 



Hydarthrosis (hi-dar-thro'-sis). See Hydrarthrosis . 



Hydatenterocele (hi-dat-en-ter' '-o-sel) [Mwp, water; 

 ivrepov, bowel ; ktjat], a tumor]. Hydrocele with in- 

 testinal hernia. 



Hydatid (hi'-dat-id) [ySarig, vesicle]. A cyst with 

 aqueous contents formed by the larva of a tenia, Echi- 

 nococcus polymorphic, the larva of a small tapeworm, 

 Tcenia echinococcus , which, in its adult (strobila) con- 

 dition is only known to infest the dog and the wolf, 

 while the larvae (hydatids) are of frequent occurrence in 

 man and other mammals. Three principal forms of 

 hydatids are recognized, viz. , exogenous, endogenous, 

 and multilocular. The first is sparingly found in 

 man, but is extremely common in the lower animals, 

 whilst the second is most frequently developed in the 

 human subject, the third kind being found only in 

 man. (Cobbold.) See Parasites (Animal), Table of. 

 The term hydatid is frequently, also, loosely applied to 

 vesicular tumors and cysts of many kinds. Hydatids 

 are most frequent in the liver, but are found in almost 

 any tissue, even in bone. H. Disease, a disease 

 characterized by the presence in various portions of 

 the body of cysts containing the embryo of the Ta>nia 

 echinococcus. The symptoms vary according to the 

 location of the tumor. H. Fremitus, a modified 

 sense of fluctuation occasionally obtained on palpating 

 an hydatid cyst. Placing the palm of one hand 

 upon the tumor, and striking the dorsum with the 

 fingers of the other hand, a tremor or thrill is per- 

 ceived. This is doubtless due to the physical condi- 

 tions of a cyst containing fluid, and provided with a 

 tense elastic wall. H. Mole. See Chorion, Cystic 

 Degeneration of , and Mole. H.of Morgagni, one of 

 certain short processes of the tunica vaginalis testis ; 

 also a similar structure connected with the fimbriated 

 extremity of the Fallopian tube. These hydatids are 

 the remnants of the Mullerian duct. H. Tapeworm. 

 See Tenia echinococcus. 



Hydatidiform (hi-dal-id'-if-orni) \yfiariq, hydatid; 

 forma, form]. Having the form of an hydatid. 

 Resembling an hydatid. H. Degeneration of the 

 Chorion, or Vesicular Mole. See Mole and 

 Chorion, Cystic Degeneration of. 



Hydatidocele (hi-dat-id' -o-sel) [udarlg, hydatid ; nr/Ar], 

 tumor]. Oscheocele with hydatid cysts. 



Hydatidoma (hi-dat-id-o'-mah) [vfiarig, hydatid; b/ia, 

 a tumor]. Any hydatid cyst or tumor. 



Hydatidosis (hi-dat-id-o' '-sis) [vdarig, hydatid]. The 

 condition of being affected with hydatids. 



Hydatogenesis (hi-dat-o-jen' -es-is) \y5up, water; 

 yeveaig, production]. The formation of water within 

 the tissues or cavities of the body. 



Hydatoncus (hi-dat-ong'-kus) [ydwp, water; bynog, a 

 tumor]. Any cyst, or watery tumor. 



Hydatorrhea (hi-dat-or-e'-ah) [udup, water; pola, 

 flow]. A copious flow of water. 



Hydatotherapy (hi-dat-o-ther'-ap-e). See Hydro- 

 therapy. 



Hyderabad Commission. See Anesthetic. 



Hydnocarpus (hid-no-kar' -pus) [bdvov, mushroom ; 

 naprrog, fruit]. A genus of poisonous bixaceous trop- 

 ical trees. H. (or Gynocardia) anthelminthicus, 

 is anthelmintic and useful in skin-diseases. H. 

 inebrians and H. wightianus have similar uses. 

 Unof. 



Hydracetin (hi-dras'-et-in) [_bSpa, a water-serpent], 

 C 6 H 5 N 2 H 2 (C 2 H 3 0). A derivative of coal-tar and a 

 powerful antipyretic and antirheumatic ; its use, 

 however, is attended with danger. Dose gr. yi to ij. 

 An ointment (10 per cent.) is recommended in pso- 

 riasis. Unof. 



Hydracid (hi-dras' -id) [wtap, water; acidum, acid]. 

 A term sometimes used in chemistry to denote an 

 acid formed by a combination of hydrogen and some 

 acid element or radicle other than oxygen. Hydro- 

 chloric acid, HC1, and hydrogen or hydric suiphid, 

 H 2 S, are examples. 



Hydradenitis (hi-drad-en-i'-tis) \yfiup, water; afiijv, 

 gland; trig, inflammation]. I. Same as Hidrosad- 

 enitis. 2. Lymphadenitis. H. destruens sup- 

 purativa. See Hydrosadenitis phlegmonosa. 



Hydradenoma (hi-drad-en-o'-ma). Same as Hidrad- . 

 enoma. 



Hydrsemia (hi-dre'-me-ah). See Hydremia. 



Hydraeropericardium (hi-drah-e-ro-per-ik-ar'-de-um) 

 [vSup, water; arjp, air; irepi, around ; tcapdia, heart]. 

 The presence of fluid and gas in the pericardium. 



Hydraeropleuria (hi-drah-e-ro-plu'-re-ah)\yfi(jip, water; 

 ar/p, air; irXevpa, side]. Same as Hydropneumothorax. 



Hydragogue (hi 1 '-drag-og) [ufiup, water ; ayoyog, 

 leading]. I. Expelling water. 2. A purgative that 

 causes copious liquid alvine discharges. 



Hydramin (hi' -dram-in) [_v6up, water ; «'»]. Any 

 one of the oxyethyl bases produced by the action of 

 aqueous ammonia upon ethylene oxid. The hydra- 

 mins are thick, strongly alkaline liquids, that decom- 

 pose upon distillation. 



Hydramnios (hi-dram' -ne-os) [ydup, water ; apviov, 

 fetal membrane]. An abnormal amount of amniotic 

 fluid. 



Hydrangea (hi-dran' '-je-ah) [ydup, water; ii] 

 vessel]. A genus of saxifragaceous shrubs. The root 

 of H. arborescensis, much used by the Cherokee 

 Indians for calculi in the bladder, is said to be of 

 some utility. Dose of the liquid extract 3 ss-ij ; of 

 a decoction ^j-ij. Unof. 



Hydrangeion (hi-dran' -je-on) [Wu/j, water, lymph ; 

 ayyelov, vessel : //., Hydrangeia~\. A lymphatic 

 vessel. 



Hydrangeitis (hi-dran-je-i' -lis) [t)<5w/>, water ; <ii ; etov, 

 a vessel ; trig, inflammation]. Inflammation of a lym- 

 phatic vessel ; lymphangitis. 



Hydrangiology (hi-dran-je-ol'-o-je) [Mop, water; </; - 

 yeuw, vessel; X6yog, science]. The science of the 

 nature, functions, and diseases of the lymphatics. 



