/ Dictionary / Index P Petavius: Meaning and Definition of Find definitions for: Pe•ta•vi•us Pronunciation: (pi-tä'vē-us), [key] — n. a walled plain in the fourth quadrant of the face of the moon: about 100 miles (160 km) in diameter from crest to crest. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. petasus petcock Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language