Word Origin & History
mussel
O.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, not fully established until 1870s.