/ Dictionary / Index P petasus: Meaning and Definition of Find definitions for: pet•a•sus Pronunciation: (pet'u-sus), [key] — pl. -sus•es. a broad-brimmed hat worn by ancient Greek travelers and hunters, often represented in art as a winged hat worn by Hermes or Mercury. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. petard Petavius Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language