GLOSSARY. 



83 



cal or geographical conformation of 

 seas, lakes, and other bodies of 

 water. 



Hydrol'ogy (Gr. v$ap, hudor, water ; 

 \oyos, logos, discourse). The science 

 which describes water. 



Hydrom'eter (Gr. vScap, hudor, water; 

 t-terpov, metron, a measure). An 

 instrument for measuring the spe- 

 cific gravity of fluids. 



Hydromet'rograph (Gr. vSup, hudor, 

 water; ^rpov, metron, a measure; 

 ypa<f)w, grapho, I write). An in- 

 strument for recording the quantity 

 of water discharged from a pipe or 

 orifice in a given time. 



Hydropericar'dium (Gr. vS<ap, hudCr, 

 water ; pericar'dium). Dropsy of 

 the pericardium or covering mem- 

 brane of the heart. 



Hydropho'bia ( Gr. uSwp, hudSr, water ; 

 <oj8o9, phob'os, fear). A disease 

 characterised by a dread of water. 



Hy'drophyte (Gr. vSoap, hudor, water ; 

 (pvw, phuo, I grow). A plant 

 which grows in the water. 



Hydro-salts (Gr. vScap, hudnr, water). 

 A name given to salts, the acid or 

 base of which contains hydrogen. 



Hydrostatic (Gr. vScap, hudor, water; 

 t<7T)7/c, liistemi, I place). Relating 

 to the pressure of fluids at rest. 



Hydrostatic Pressure. The pressure 

 of water or any fluid, at rest, on a 

 given surface. 



Hydrostatics (Gr. vSup, Tiuddr, 

 water ; i<rrr]/jLi, histemi, I make to 

 stand). The science which treats 

 of the properties of fluids at rest. 



HydrosuTphuret (Hydrogen and 

 Sulphur). A compound of hydro- 

 sulphuric acid with a base: now 

 described by chemists as a sulphide, 

 or compound of sulphur with a 

 metal, together with an equivalent 

 of water. 



Hydrotho'rax (Gr. u5op, hudor, 

 water ; 6upa, thorax, the chest). 

 A disease characterised by the 

 presence of water in the chest; 

 dropsy of the chest. 



Hydrous (Gr. vScap, hudor, water). 

 Containing water ; watery. 



Hydrozo'a (Gr. v5pa, hudra, a water- 

 serpent ; faov, zoon, an animal). 



The polypes which are organised 

 like the hydra. 



Hyetog'raph.y (Gr. veros, hu'etos, 

 rain ; ypa^ta, graph' o, I write). 

 The science of rain ; the knowledge 

 of the quantities and localities in 

 which rain has fallen in a given 

 time. 



Hygiene (Gr. vyn)s,hu'gies, healthy). 

 The science which treats of the 

 preservation of health. 



Hygienic (Gr. vyiys, ku'gits, healthy). 

 Relating to the health and its pre- 

 servation. 



Hygro- (Gr. vypos, hu'gros, moist). 

 A prefix in compound words, im- 

 plying moisture. 



Hygrom'eter (Gr. vypos, hugros, 

 moist ; fterpov, metron, a measure). 

 An instrument for measuiing the 

 amount of moisture in the atmos- 

 phere. 



Hygromet'ric (Gr. vypos, hugros, 

 moist : p.erpov, metron, a measure). 

 Relating to the measurement of 

 the moisture in the air ; readily 

 absorbing moisture from the air. 



Hygrom'etry (Gr. vypos, hu'gros, 

 moist ; fj-erpov, metron, a measure). 

 The branch of meteorological science 

 which treats of the measuring the 

 . pressure, quantity, and effects, of 

 watery vapour in the atmosphere. 



H/groscope (Gr. vypos, hugros, moist ; 

 o-Koira>, skop'eo, I view). An in- 

 strument for ascertaining approxi- 

 matively the moisture of the at- 

 mosphere. 



Hygroscopic (Gr. vypos, hugros, 

 moist ; cr/coTrew, skop'eo, I view). 

 Liable to absorb moisture from the 

 air. 



Hyme'nium (Gr. VU.TIV, humen, a mem- 

 brane). The mass formed by the 

 union of the organs of fructification 

 in the mushroom tribe. 



Hymenop'tera (Gr. V/J.T)V, humen, a 

 membrane ; irrepov, pter'on, awing). 

 An order of insects having fine 

 membranous wings, as bees and 

 wasps. 



Hy'o- (The Greek letter v, or upsilon). 

 In anatomy, a prefix in compound 

 words, implying connection with 

 the hyoid bone. 



