/ Dictionary / Index B Byrgius: Meaning and Definition of Find definitions for: Byr•gi•us Pronunciation: (bēr'gē-us), [key] — n. a crater in the third quadrant of the face of the moon: about 40 miles (64 km) in diameter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. byre-man Byrne Related Content Daily Word Quiz: ablution Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language