/ Dictionary / Index H hydrous: Meaning and Definition of Find definitions for: hy•drous Pronunciation: (hī'drus), [key] — adj. containing water. containing water or its elements in some kind of union, as in hydrates or hydroxides. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hydrous (Thesaurus) hydrotropism hydroxide Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language