/ Dictionary / Index H hazardous: Meaning and Definition of Find definitions for: haz•ard•ous Pronunciation: (haz'ur-dus), [key] — adj. full of risk; perilous; risky: a hazardous journey. dependent on chance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hazardous (Thesaurus) hazard hazardous waste Related Content Daily Word Quiz: modify Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language