HYD 



204 



HYD 



water), a compound containing a 

 definite proportion of water chem- 

 ically combined : hydrated, a., 

 htd'rdt'8d, combined with water 

 in definite proportions : hydra- 

 tion, n., htd-rd-sh'&n, the act or 

 state of becoming chemically 

 combined with water. 



hydraulic, a., hid-rdtffKtk (Gr. 

 hudor, water ; aulos, a pipe), 

 relating to the conveyance of 

 water through pipes ; worked by 

 water : hydraulics, n. plu. , hid- 

 roJwl'-iks, the science which treats 

 of the application of the forces 

 influencing the motions of fluids; 

 the art of raising, conducting, 

 and employing water for practical 

 purposes. 



hydrencephalocele, n., hid'-r$n- 

 s%f'al''d'Sel (Gr. hudor ', water ; 

 engkephalon, the brain ; kele, a 

 tumour), a tumour occasioned by 

 hernial protrusion of the mem- 

 brane of the brain and the fluid 

 contents of the cranium, through 

 a deficiency in the latter. 



hydro, hid r -rd, and hydr, hid'-r 

 (Gr. hudor, water), prefixes 

 in scientific terms denoting the 

 presence, action, or quality of 

 water ; denoting the presence of 

 hydrogen : hydro-carbon, kdrtf 

 8n (Eng. carbon), a compound of 

 hydrogen and carbon ; a term 

 usually applied to bitumens, 

 mineral resins, and mineral fats 

 which are composed of hydrogen 

 and carbon in varying propor- 

 tions: hydro-carburet, n., hid'-ro- 

 kdrb'ur'et, a compound of hydro- 

 gen and carbon ; hydro-carbon. 



hydrocaulus, n., hid'-rd'kdwl'-us 

 (Gr. hudra, a water serpent ; 

 kaulos, a stem), in zool., the 

 main stem of the coenosarc of a 

 hydrozoon. 



hydrocele, n., lild'-ro-sel (Gr. 

 hudor, water ; kele, a tumour), 

 dropsy of the testicle ; a collec- 

 tion of serum in the external or 

 serous covering of the testicle. 



hydrocephalus, n., hid'-rd-sef'-ul- 



Us (Gr. hudor, water ; kephale, 

 the head), a disease chiefly char- 

 acterised by an accumulation of 

 serous fluid in the central cavities 

 of the brain, and frequently a 

 result of tubercular disease ; 

 dropsy or water in the head : 

 hydrocephalic, a., hid'rd'Sef'dl' 

 ik, relating to or connected with 

 hydrocephalus. 



HydrocharidaceaB, n. plu., hid'-ro- 

 kar'-id-d'se'-e (Gr. hudor, water ; 

 charis, grace, beauty), the Frog- 

 bit family, an Order of floating 

 or aquatic plants found in vari- 

 ous parts of the world : Hydro- 

 charis, n., hid-rd'k'ar'is, a genus 

 of pretty aquatic plants, forming 

 one of the prettiest ornaments 

 of our still waters. 



hydrochlorate, n., hld'-rd-kld^-at 

 (Eng. hydrogen and chlorine], a 

 compound of hydrochloric acid 

 with a base : hydrochloric, a. , 

 hid'rd'kldr'ik, consisting of a 

 combination of hydrogen and 

 chlorine; denoting an acid known, 

 also as muriatic acid and spirit 

 of salt. 



Hydrocotyle, n., hid'>ro-kdt'il>e 

 (Gr. hudor, water ; Tcotule, a 

 hollow, a cavity), a genus of 

 plants, Ord. Umbelliferas : Hyd- 

 rocotyle Asiatica, dzh'i-at'-ik-a 

 (of or from Asia], a species used 

 in medicine: H. vulgaris, vul- 

 gar'-is (L. vulgaris, general, 

 common), a curious little native 

 Umbellifer, called Pennywort, 

 having round peltate leaves, 

 growing in marshy situations, 

 and reported injurious to sheep. 



hydrocyanic, a., lild'-rd'Sl-wnf-ik 

 (Gr. hudor, water; kuanos, dark- 

 blue), denoting an acid consisting 

 of hydrogen and cyanogen ; 

 Prussic acid : hydrocyanate, n. , 

 hid'-rd'Si'-an-at, a compound of 

 hydrocyanic acid with a base. 



hydrocysts, n. plu., hld f -r6-sists 

 (Gr. hudra, a water serpent ; 

 kustis, a bladder, a cyst), in zoo/. , 

 curious processes attached to the 



