/ Dictionary / Index R regius: Meaning and Definition of Find definitions for: re•gi•us Pronunciation: (rē'jē-us, -jus), [key] — adj. of or belonging to a king. (of a professor in a British university) holding a chair founded by or dependent on the sovereign. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. registry office regle Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language