Webster's English Dictionary

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muscle

1. mus.cle \'m*s-*l\ n [MF, fr. L musculus, dim. of mus mouse, muscle - 
   more at MOUSE] often attrib  1a: a tissue that functions to produce motion 
   and is made of elongated cell s capable of contracting when stimulated 1b: 
   an organ that contracts to produce, enhance, or check a particular move 
   ment and is made up of muscle tissue and firmly attached at either end to a 
   fixed point 2a: muscular strength : BRAWN  2b: effective strength : POWER 
2. muscle \-(*-)lin\ vi or mus.cling : to make one's way by brute strength 
   or by force