/ Dictionary / Index S sarcolemma: Meaning and Definition of Find definitions for: sar•co•lem•ma Pronunciation: (sär"ku-lem'u), [key] — n. Anat. the membranous sheath of a muscle fiber. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sarcolemma (Thesaurus) sarcoidosis sarcology Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language