Definition of mussel noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈmʌsl//
; NAmE NAmE//ˈmʌsl//
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a small shellfish that can be eaten, with a black shell in two parts See related entries: Invertebrates Word OriginOld English mus(c)le, superseded by forms from Middle Low German mussel, Middle Dutch mosscele; ultimately from late Latin muscula, from Latin musculus, diminutive of mus ‘mouse’ (some muscles being thought to be mouse-like in form).
See the Oxford Advanced American Dictionary entry: mussel