/ Dictionary / Index H hydracid: Meaning and Definition of Find definitions for: hy•drac•id Pronunciation: (hī-dras'id), [key] — n. an acid that does not contain oxygen, as hydrochloric acid, HCl. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hydra hydraemia Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language