HYD 



206 



HYM 



rosulphuric, a., hld'-ro-sul/'Ur'- 

 ik, pert, to or derived from 

 hydrogen and sulphur. 



hydrotheca, n. plu., hid'-ro-iheMti 

 (Gr. hydra, a water snake; theke, 

 a chest), in zool., the little chit- 

 inous cups in which certain 

 polypites are protected. 



hydrothorax, n., hld'-rd-thdr'-aks 

 (Gr. hudor, water ; thorax, the 

 chest), a dropsical accumulation 

 of fluid in the pleural sac ; water 

 in the chest. 



Hydrozoa, n. plu., hid'-rd-zo'-d 

 (Gr. hudra, a water serpent ; 

 won, an animal), in zool., gelat- 

 inous, oblong, or conical polypes 

 organized like the hydra ; the 

 class of the Ccelenterata com- 

 prising animals constructed like 

 the hydra. 



hydruria, n., hid-rdr'-i-a (Gr. 

 hudor, water ; ouron, urine), an 

 excessive secretion of limpid, 

 watery urine. 



hygiene, n., hity-en' (L. Hygeia, 

 Gr. Hugeia,ihe goddess of health), 

 that department of medical prac- 

 tice which treats of health, its 

 preservation, restoration, and 

 maintenance. 



hygrometer, n., M-gr&mf-<tt*er (Gr. 

 hugros, wet, moist ; logos, dis- 

 course), an instrument for measur- 

 ing the degree of moisture in the 

 atmosphere : hygrometric, a., 

 hi'-gro-met'-rik, of or relating to 

 the hygrometer ; in bot. , moving 

 under the influence of moisture. 



hygrophanous, a., hi-grof'-an-us 

 (Gr. hugros, wet ; phaino, I 

 show), in bot., appearing watery 

 when moist, but becoming opaque 

 when dry. 



Hygrophoms, n., lil-grof-or-tis 

 (Gr. hugros, wet, moist ; phoreo, 

 1 bear), a genus of plants, Ord. 

 Fungi : Hygrophoms pratensis, 

 pra>t$ns'>is (L. pratensis, growing 

 in meadows from pratum, a 

 meadow), a species of fungi, 

 called the Herefordshire truffle. 



hygroscope, n., hi'-grd-skop (Gr. 



hugros, water, moisture ; sTcopeo, 

 I see or view), an instrument to 

 show the moisture or drynessofthe 

 air: hygroscopic, a., M'-grd-skopt 

 ik, pert, to ; applied to moisture 

 not readily apparent. 



hymen, n., him'-en (Gr. humen, 

 a thin membrane; Gr. Humen, L. 

 Hymen, the god of marriage, the 

 son of Bacchus and Venus), the 

 valvular fold of membrane which 

 protects the virginal vagina : 

 hymeneal, a., him'en'e'al, pert, 

 to marriage. 



Hymensea, n,, him'8n-e'a (Gr. 

 Humen, L. Hymen, the god of 

 marriage), a genus of trees, Ord. 

 Leguminosse, Sub-ord. Csesalpin- 

 ieae, whose species are highly 

 ornamental, so named from its 

 two leaflets : Hymenaea Courbaril, 

 kdr'bar-il (unascertained), the 

 West Indian locust tree ; the 

 pods supply a nutritious matter, 

 its inner bark is anthelmintic, 

 and the plant yields a kind of 

 resin called Anime. 



hymenium, n., him-en'i-um (Gr. 

 humen, a membrane), in bot., 

 that portion of the fructification 

 of a fungus in which the sporules 

 are situated, usually more or less 

 a membranous expansion ; the 

 part which bears the fructification 

 in Agarics : hymenial, a., him- 

 en'-i-al, belonging to the hymen- 

 ium: hymenicolar, a., him'-Zn-itt 

 ol-ar (L. colo, I inhabit), in bot., 

 inhabiting the hymenium. 



Hymenomycetes, n., him^n^d- 

 mi'Set f *ez (Gr. humen, a membrane; 

 mukes, a fungus), a division of 

 the Fungi in which the hymenium 

 is naked; the spores appear in sets 

 of four, borne on distinct sporo- 

 phores, as seen in mushrooms. 



hymenophorum, n., Mnt<6n'8f-or* 

 urn (Gr. humen, a membrane ; 

 phoreo, I bear), in bot., the 

 structure which bears the hymen- 

 ium. 



HymenophylleaB, n. plu.,him f -en-o- 



fil'-tt'G (Gr. humen, a membrane; 



