/ Dictionary / Index S sirloin: Meaning and Definition of Find definitions for: sir•loin Pronunciation: (sûr'loin), [key] — n. the portion of the loin of beef in front of the rump. See diag. under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sirloin (Thesaurus) Sirius sirocco Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language