/ Dictionary / Index R reguline: Meaning and Definition of Find definitions for: reg•u•line Pronunciation: (reg'yu-lin, -līn"), [key] — adj. Metall. of, pertaining to, or of the nature of, a regulus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. regulatory gene regulus Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language