HYI>k ' 





HYDROBIOSIS 



rate "' nl an 



radical 



■ 



: | I i. 



ilcd 



stable gas, 

 :..r and .1 strong 

 from n. 



de 

 ■ I its 

 al. 



'urn, 

 mic 

 phenylhydrazin 

 usually crystal- 

 yellow 

 . | >ose 



rccium . house : 



: iception 

 I to the swimming- 



. water; ^rarstq, 

 ntion by water or l>v a watery 



remesis . water; iiuotq, 



?ati ry material. 

 . wati r ; ciifia, blood]. 

 id due to defective 

 t fibrination. It accom 

 .un other exhausting dis- 



rencephal [vdup, water; ■ 



ilic brain. 



rencephalit: , water; 



inflammation], [nflammatory 



rencephalocele . wa 



. hernia]. Encephalocele 

 it i omposed of a watery 

 H. palatina, a variety of hydrencephal 

 in wh i with serum, pro- 



■, a tumor p< «^-,i i>l y as 



rencephalu . 



•renterocele [vdup, water; 



il hernia, 

 • d fluid. 

 li '.rentcrorrhc.i . |P< water; 



tery diarrhea. 



6c, heal- 

 with water 

 . physi 



'. ith 



iter. 



i I \ impound 



H Acid, 



i and 



*" C. Thi yrup ol 



hydriodic acid contains i per cent, of absolute HI. 

 1 lose, ,t j-iv, well diluted. 



Hydro- (hi'-dro water]. A prefix signifying 



water, or that water forms a structural part. See, 

 i. Hydrate. 



Hydroa (hi-dr^-ah) [e<'(.'/>, water; adv, egg]. A 

 term including a group of vesicular and bullous skin- 

 affections presenting many points of affinity with vesi- 

 cating ervthemata. lit rpes, ami pemphigus. The group 

 include: the disca-.es described as Dermatitis herpeti- 

 lis, Pemphigus pruriginosus, Urticaria vesicans, 

 i Herpes gestationis, and i-, byno means uncommon. 

 Hydroa occurs in individuals of the neurotic tempera 

 meiii ; its course i- chronic, but with a decided tendency 

 toward ultimate recovery. [Hydroa, as the name ol a 

 skin disease, is much confused in meaning with Hidroa, 

 q. v.) H. bullosa. Sec //. pruriginosum. H. 

 aestivale. See //. vacciniforme. H. febrile. See 

 Herpes facialis. H. gestationis, that of pregnancy. 

 H. herpetiforme. Also called Dermatitis herpeti- 

 formis : Herpes gestationis; Herpes circinatus bullo- 

 sus ; Pemphigus circinatus. See Pemphigus prurigi- 

 us. H. pruriginosum. Hydroa bullosa ; a very 

 rare form, attended at its development with intense 

 itching, and sometimes preceded by slight febrile 

 symptoms, followed by the formation of small bullae 

 not exceeding the size of a split pea, and commencing 

 as vesicles, without any antecedent lesion. Slight 

 umbilication occurs, followed by desiccation, and the 

 formation of scales or crusts. Successive crops are 

 formed, the bulla: being discrete or grouped irregu- 

 larly, but never in circles. H. puerorum. See //. 

 ini forme. H. vacciniforme. Hydroa cestivale ; 

 Hydroa puerorum : Recurrent summer eruption ; a 

 recurring summer eruption of boyhood, usually with 

 vesicles that leave scars. The disease generally 

 begins in the first, second, or third year of life, and i> 

 often preceded by articular symptoms. The eruption 

 develops chiefly on the uncovered parts, and is generally 

 preceded by burning or pain, fulness of the region at- 

 tacked, anorexia, and insomnia. Red spots appear, and 

 on these rounded vesicles develop, singly or in groups, 

 varying in size from that of a millet-seed to that of a 

 large pea. They may coalesce into an irregularly out- 

 lined flattish bulla. The redness remains as an areola. 

 I hese bullre dry up, rupture, or become umbilicated, 

 and form crusts which, on separating, leave slightly 

 depressed scars resembling those of smallpox. The 

 pathology is unknown. 



Hydroadipsia {hi-dro-ad-ip 1 '-se-ah) \y6ap, water; <), 

 priv. ; 6ii\>a, thirst]. Absence of thirst, or of desire 

 t' ir water. 



Hydrobenzamid [ki-dro-ben / -zam-id) [iA<.>i>, water; 

 benzoin; ami, I], C.TI^X.,. Azobenzoyl hydrid, a 

 talline compound, soluble in alcohol. 



Hydrobenzoin {hi-dro-ben-zo* -in) [rrSw/i, water; ben- 

 zoin ] , t , ,1 1 |( t »,. A compound prepared bythe action 

 of sodium amalgam on benzoin. It dissolves with 

 difficulty in water, is readily soluble in alcohol, and 

 crystallize-, in large, shining, rhombic plates, melting 

 at i J4° I '.. 



Hydrobilirubin \hi-dro-bil-e-ru f -bin) [vdup, water; 



bills, bile; ruber, red ], ( '...,1 1 ((1 \' ( ( ).. A rose-red or 



vii red pigment formed by treating a solution of 



bilirubin or biliverdin in dilute alkali with sodium 



ilgam. It is slightly soluble in water, easily so in 



alcohol, ether, and chloroform. It is a coloring- 



. said to be identical with stercobilin, 



and found in urine. 



Hydrobiosis [hi-dro-bi-o' -sis) [ydup, water; Q'uoc, life]. 

 In biology, the origin and maintenance of life in fluid 

 i in. 



