80 



A GLOSSARY OF TERMS 



posed of hydrogen and chlorine, 

 formerly known as muriatic acid. 



HT DBOCO msm. fr. gr. 'wrfor, wa- 

 ter ; koris, a bug. A tribe of in 

 sects, including the water-bug. 



HYDROCYA'NIC. fr. gr. udftr, water ; 

 kuanos, blue. The name of an 

 intensely poisonous and peculiar 

 acid. 



HYD'ROGEIT. fr. gr. uddr, water; 

 gennaein, to generate. A colour- 

 less, tasteless, inodorous gas, one 

 part of which, by weight, com- 

 bined with eight parts of oxygen, 

 forms water ; combined with 

 sulphur, it constitutes sulphuretted 

 hydrogen; and with carbon, car- 

 bur -etted hydrogen, the gas used 

 for illumination. 



HYDRO'PHAWOUS. fr. gr. uddr, wa- 

 ter ; phaino, to shine. Applied to 

 certain stones which become trans- 

 lucent when placed in water. 



HYDROSTA'TIC. fr. gr. uddr, water ; 

 stab, I stand. Relating to water 

 in a state of rest. Hydrostatics 

 is the science which treats of the 

 equilibrium and pressure of wa- 

 ter and other liquids. 



HYDROZO'A. Hydriform polyps. 



HYDROPHYTES. Water-plants. 



HYD'RUS. Lat. A water-snake. 



HYEMA'LIS. Lat. Belonging or re- 

 lating to winter. 



HYLA. fr. gr. ule, a wood ; trees. 

 Systematic name of the tree-frog. 



HYLO'TOMOUS. fr. gr. ulotolomos, a 

 wood-cutter. Applied to insects 

 that penetrate wood. 



HYME'NIUM. fr. gr. umen, a mem- 

 brane. That part of a fungaceous 

 plant in which the sporules im- 

 mediately lie. 



H YMENOP'TERA. fr. gr. umen, a mem- 

 brane ; pteron, wing. Systematic 

 name of a class of insects, cha- 

 racterized by membranous wings. 



HYMEXOP'TEHJE. Lat. plur. of Hy- 

 menoptera. 



HY'oin.-fr. gr. u ; eidos, resemblance. 

 Resembling the shape or form of 

 the letter U. The os hyoides, the 



hyoid bone, is a very moveable 

 bony arch, placed horizontally in 

 the substance of the soft parts of 

 the neck, at the root of the tongue. 

 It does not articulate with any 

 other bone of the skeleton, and is 

 only connected to it through the 

 medium of muscles and liga- 

 ments. The general characters 

 of the hyoid bone, are the same 

 in all vertebrate animals. In 

 fishes, its branches are composed 

 of several pieces, and give sup- 

 port to the branchiostegous rays. 



HYOSCIA'MUS. fr. gr. us, a swine ; 

 kuamos, a bean. Henbane. 



HYPER. fr. gr. uper, over or above. 

 A prefix denoting above or excess. 



HY'PERSTHEUE. Labrador horn 



blende. It contains iron, si'lica 

 and magnesia. Hypersthene rock 

 differs from common hornblende 

 only in its foliated crystallization, 

 and its pearly or metallic-pearly 

 lustre. It is a very tough rock, 

 with a structure resembling gneiss. 



HYP,-HYPO. fr. gr. upo, under. A 

 prefix denoting under or a defi- 

 ciency. 



HYPXOIDES. fr. gr. upnon, a sort of 

 moss; eidos, resemblance. Spe 

 cific name of a fossil plant. 



HYPOCRATE'RIFORM. fr. gr. upo, un- 

 der ; krater, cup ; forme, shape. 

 Salver-shaped. 



HY'POGENE. fr. gr. upo, under; gei- 

 nomai, I am formed. A class of 

 rocks which have not assumed 

 their present form and structure 

 at the surface of the earth, but 

 are apparently of igneous origin 

 and thrust up from below. 



HYPOGY'KOUS. fr. gr. upo, under; 

 gune, pistil. Arising beneath the 

 ovary. 



HYPOPE'TALOUS. Relating to hypo- 

 petaleae. 



HYPOPETA'LEJE. fr. gr. upo, beneath ; 

 petalon, petal. Name of a class 

 of plants. 



HYPOPH'YLLOUS. Under the leaf 



HYPO'THESIS. fr. gr. upo, under; 



