Source : Webster's Revised Unabridged Dictionary (1913)

Sarcolemma \Sar`co*lem"ma\, n. [NL., from Gr. sa`rx, sa`rkos,
   flesh + ? rind, skin.] (Anat.)
   The very thin transparent and apparently homogeneous sheath
   which incloses a striated muscular fiber; the myolemma.

Source : WordNet®

sarcolemma
     n : an extensible membrane enclosing the contractile substance
         of a muscle fiber