/ Dictionary / Index R regulus: Meaning and Definition of Find definitions for: reg•u•lus Pronunciation: (reg'yu-lus), [key] — pl. -lus•es, -li (cap.)a first magnitude star in the constellation Leo. the metallic mass that forms beneath the slag at the bottom of the crucible or furnace in smelting ores. an impure intermediate product obtained in smelting ores. Reg•u•lus Pronunciation: (reg'yu-lus), [key] died 250?b.c.,Roman general. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: regulus (Thesaurus) reguline regurgitate Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language