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Main Entry: 1mus·cle
Etymology: from Latin musculus "muscle, little mouse," from mus "mouse" 1 a: a body tissue consisting of long cells that can contract and produce motion b: an organ that is a mass of muscle tissue attached at either end to a fixed point (as to bones) and that by contracting moves or stops the movement of a body part 2 a: muscular strength : BRAWNb: 1POWER 2 <lacks the muscle to make good on campaign promises> Word History People today are perhaps unlikely to think of their muscles as resembling mice. The ancient Romans, however, saw a likeness, especially in the major muscles of the arms and legs. For that reason the Latin word musculus, which originally meant "little mouse," came to be used to mean "muscle."