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- English Word Hydage Definition A land tax. See Hidage.
- English Word Hydantoic Definition Pertaining to, or derived from, hydantoin. See Glycoluric.
- English Word Hydantoin Definition A derivative of urea, C3H4N2O2, obtained from allantion, as a white, crystalline substance, with a sweetish taste; -- called also glycolyl urea.
- English Word Hydatid Definition A membranous sac or bladder filled with a pellucid fluid, found in various parts of the bodies of animals, but unconnected with the tissues. It is usually formed by parasitic worms, esp. by larval tapeworms, as Echinococcus and Coenurus. See these words in the Vocabulary.
- English Word Hydatiform Definition Resembling a hydatid.
- English Word Hydatoid Definition Resembling water; watery; aqueous; hyaloid.
- English Word Hydr- Definition See under Hydro-.
- English Word Hydr- Definition A combining form from Gr. /, /, water (see Hydra).
- English Word Hydr- Definition A combining form of hydrogen, indicating hydrogen as an ingredient, as hydrochloric; or a reduction product obtained by hydrogen, as hydroquinone.
- English Word Hydra Definition A serpent or monster in the lake or marsh of Lerna, in the Peloponnesus, represented as having many heads, one of which, when cut off, was immediately succeeded by two others, unless the wound was cauterized. It was slain by Hercules. Hence, a terrible monster.
- English Word Hydra Definition Hence: A multifarious evil, or an evil having many sources; not to be overcome by a single effort.
- English Word Hydra Definition Any small fresh-water hydroid of the genus Hydra, usually found attached to sticks, stones, etc., by a basal sucker.
- English Word Hydra Definition A southern constellation of great length lying southerly from Cancer, Leo, and Virgo.
- English Word Hydra-tainted Definition Dipped in the gall of the fabulous hydra; poisonous; deadly.
- English Word Hydrachnid Definition An aquatic mite of the genus Hydrachna. The hydrachnids, while young, are parasitic on fresh-water mussels.
- English Word Hydracid Definition An acid containing hydrogen; -- sometimes applied to distinguish acids like hydrochloric, hydrofluoric, and the like, which contain no oxygen, from the oxygen acids or oxacids. See Acid.
- English Word Hydracrylic Definition Pertaining to, or designating, an isomeric variety of lastic acid that breaks down into acrylic acid and water.
- English Word Hydractinian Definition Any species or marine hydroids, of the genus Hydractinia and allied genera. These hydroids form, by their rootstalks, a firm, chitinous coating on shells and stones, and esp. on spiral shells occupied by hermit crabs. See Illust. of Athecata.
- English Word Hydrae Definition of Hydra
- English Word Hydraemia Definition An abnormally watery state of the blood; anaemia.