Word Origin & History
musselO.E. muscle, musscel, from L.L. muscula (cf. O.Fr. musle, modern Fr. moule), from L. musculus "mussel," lit. "little mouse," also "muscle;" like muscle, derived from mus "mouse" on the perceived similarity of size and shape. The modern spelling, distinguishing the word from muscle, first recorded 1610,
EXPANDnot fully established until 1870s.
COLLAPSE