/ Dictionary / Index C colonus: Meaning and Definition of Find definitions for: co•lo•nus Pronunciation: (ku-lō'nus), [key] — pl. -ni a serf in the latter period of the Roman Empire or in the early feudal period. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. colonoscope colony Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language