/ Dictionary / Index P perilous: Meaning and Definition of Find definitions for: per•il•ous Pronunciation: (per'u-lus), [key] — adj. involving or full of grave risk or peril; hazardous; dangerous: a perilous voyage across the Atlantic in a small boat. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: perilous (Thesaurus) perilla oil peril point Related Content Daily Word Quiz: serendipity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language