HYDROCARDIA 



563 



HYDRODIURESIS 



Hydrocardia (hi-dro-kar* -de-ah). See Hydropericar- 

 dium. 



Hydrocaulus (hi-dro-kav/ lus) [iSup, water ; nav/.6c , a 

 stem : //. , Hydrocauli\ . In biology, the main stem of 

 a hydrozoan colony. 



Hydrocele (hi' -dro-sel) [viup, water;' kjj'/j), tumor]. 

 A collection of serous fluid in the tunica vaginalis 

 testis, or in connection with the testicle or cord. The 

 term is applied, also, to a serous tumor in other loca- 

 tions. 



Hydrocelia (hi-dro-se' -U-ah) [i-6up, water; Koi/ua, 

 belly]. Dropsy of the belly or abdominal region. 



Hydrocellulose (hi-dro-sel' -u-los) [bSup, water ; cellula, 

 a little cell], CjjHjjO,,. A body formed by moisten- 

 ing cellulose with a dilute mineral acid, and then dry- 

 ing. It is used in photography. 



Hydrocelodes (hi-dro-sel-o / -a'ez) [y&up, water; kh'/ji, 

 tumor ; t \6oc , form] . A tumor resembling hydrocele, 

 but due to an extravasation of urine. 



Hydrocenosis (hi-dro-sen-(/-sis) [i'dup, water; Ktvaaic, 

 evacuation]. An evacuation of water either by the 

 use of hydragogue cathartics or by the operation of 

 " tapping ' ' the cavity containing the accumulation of 

 fluid. See Paracentesis. 



Hydrocenotic (hi-dro-sen-oP-ik) [vSup, water ; nevaaic, 

 evacuation]. Relating to or causing hydrocenosis. 



Hydrocephalic (hi-dro-sef-al '-ik) [vSup, water ; K£<j>a?.J/, 

 head]. Pertaining to or affected with hydrocephalus. 

 H. Cry, the shriek of pain of the hydrocephalic 

 child during the exacerbations. 



Hydrocephalitis (hi-dro-sef-al-i f -tis) . See Hydrenceph- 

 alitis. 



Hydrocephalocele (hi-dro-sef -al-o-sel) [i-Sop, water ; 

 Keoa'/.i], head ; taftJi, a tumor]. Congenital hydro- 

 cephalus in which the encephalon protrudes through 

 the ununited or undeveloped cranial wall. 



Hydrocephaloid (hi-dro-sef' -at-oid) [vSup, water; 

 K£$a/.i], head ; eldoc, form]. Pertaining to or resem- 

 bling hydrocephalus. H. Disease, Marshall Hall's 

 Disease ; a disease resembling hydrocephalus, some- 

 times observed in poorly-nourished infants just after 

 weaning. It is a condition of nervous exhaustion, 

 generally coming on after a prolonged illness, or fol- 

 lowing premature weaning. There is a stage of irrita- 

 bility and one of torpor. The pulse is irregular, 

 the fontanel flaccid and hollow, and there is no, or 

 but slight , tendency to vomiting. Stimulants and tonics 

 arrest the progress of the condition. 



Hydrocephalus (hi-dro-sef '-al-us) [viup, water ; ke- 

 <ba?Jt, head]. A collection of fluid in the cerebral 

 ventricles (internal hydrocephalus) or outside the brain- 

 substance (external hydrocephalus), preventing closure 

 of the fontanels and causing enlargement of the skull. 

 The head may measure as much as thirty inches in cir- 

 cumference. Wormian bones develop in the sutures and 

 fontanels ; the eyeballs are rendered prominent and at 

 the same time their axes are depressed. Often there is 

 a retardation of the mental development, and the patient 

 usually dies within a few years. An acute hydrocephalus 

 occurs in meningeal inflammation. The chronic form is 

 congenital or infantile. 



Hydrochinone (ki-dro -hi' -non) [vSup, water ;qtiinone~\, 

 C 6 H 6 2 . A substance existing in urine as an ethereal 

 compound with H,S0 4 ; it is largely the cause of the 

 dark color that this excretion assumes after the ab- 

 sorption of phenol on exposure to the air. 



Hydrochlorate (hi-dro-klt/ -rat) [viup, water; ^/-upof, 

 green]. Any salt or compound of hydrochloric acid. 



Hydrochloric Acid (hi-dro-klo f -rik). See Acid, Hy- 

 drochloric. 



Hydrochlorid (hi-dro- chic/ -rid) [vdup, water; x/.Ctpoq, 

 green]. Same as Hydrochlorate. 



Hydrocholecystis (hi-dro-ko-le-sis'-tis) [ISup, water ; 

 Xo'/J), bile; kvotic, bladder]. Dropsy of the gall- 

 bladder. 



Hydrocinnamic Acid (hi-dro-sin-am'-ik). See Acid. 



Hydrocirsocele (hi-dro-sir* -so-sel) [wfcjp, water ; iupo6r t 

 venous enlargement ; idj/J/, tumor]. Hydrocele ac- 

 companied with varicose veins of the spermatic cord. 



Hydroccelia (hid-rose* -U-ah). See Hydrocelia. 



Hydrocceroulignone (hi - dro - se-ru-lig' -non) [viup, 

 water; caerulcus, blue ; lignum, wood] .CjgHj^Og. A 

 divalent phenol, crystallizing from alcohol and glacial 

 acetic acid in colorless leaflets, and melting at 

 I90 C. 



Hydrocollidin (hi-dro-kol' -id-in) [viup, water; n6?j>a, 

 glue]. A highly poisonous ptomaine-base, so named 

 by Gautier and Etard, and declared by them to be 

 identical with the hydrocollidin obtained by Cahours 

 and Etard from the action of selenium on nicotin. 

 Nencki, on the other hand, asserted its identity with a 

 base (collidin) isolated by him in 1876, to which he 

 had ascribed the formula C s H n X. The formula of 

 Gautier and Etard's hydrocollidin is CgH 13 X. This 

 ptomaine was obtained from chloroformic extracts, 

 from putrefying mackerel, and putrefying horse-flesh 

 and ox-flesh. The free base is an almost colorless, 

 alkaline, oily fluid, having a strong, penetrating odor 

 like syringa. So small a dose as 0.0017 gram of the 

 hydrochlorid, injected into birds, produced dizziness, 

 paralysis, and death. The pupils remain normal, and 

 the heart stops in diastole. 



Hydrocolpocele (hi-dro-kol' -po-sil) [i'dup, water; 

 k6/-oc, vagina ; Ktj/.t), tumor]. A serous tumor of the 

 vagina. 



Hydrocotarnin (hi-dro-ko-tar* -nin) \i-Sup, water ; co- 

 larnin\, CjjHjjNOj rf- ^ H,0. A crystalline alkaloid 

 occurring in small amount in opium. It melts at 50 

 C. , and is readily soluble in alcohol, ether, and chloro- 

 form. 



Hidrocotoin (hid-ro-ko / -to-in) \liup, water; Sp., coto, 

 a cubit], C| 5 H u 4 . An alkaloid of coto-bark, occur- 

 ring in yellowish crystals without taste. 



Hydrocotyle (hi-dro-kot* -il-e) [vdup, water; kotv/.tj, a 

 cup]. Pennywort ; a genus of umbelliferous herbs. 

 The leaves of H. asiatica serve as a bitter tonic and 

 alterative, and are very serviceable in skin-diseases, 

 syphilitic sores, and leprosy. H. centella, of S. Africa, 

 H. umbellata, of America, and H. vulgaris, of 

 Europe, have been employed in medicine, but their 

 properties are little known. H. bonariasis, of S. 

 America, is diuretic. All unof. 



Hydrocrania (hid-ro-kra'-ne-ah). Same as Hydro- 

 cephalus. 



Hydrocyanic (hi-dro-se-an' -ik). See Cyanogen, and 

 Acid, Hydrocyanic. 



Hydrocyst (hi'-dro-sisf) [vSop, water; mor/c, blad- 

 der]. A cyst containing a water-like liquid. Some- 

 times it is synonymous with hydatid. In biology, 

 Huxley's name for singular organs found in certain of 

 the Hydrozoa (especially the Physophoridce). They are 

 pyriform sacs of ectoderm and endoderm, closed at 

 their distal ends, but in free communication with the 

 somatic cavity at their proximal ends ; they are ar- 

 rested polypites in which the mouth has never become 

 developed. 



Hydroderma (hi-dro-der 1 '-mah) [idop, water; depua, 

 skin]. Dropsy of the skin. 



Hydrodictyotomy (hi-dro-dik-U-o? -o-me) \i-iup, water; 

 Siktvov, net; tout), section]. Surgical incision of the 

 retina for the relief of edema. 



Hydrodiuresis (hi-dro-di-u-re , -sis) [y&up, water; 6id, 

 through ; ovpietv, to make water]. A copious flow of 

 watery urine. 



