One of the mysteries of the English language finally explained.
Originally: resembling a mussel, especially in shape. Later: specifically of or belonging to the order Mytiloida of marine bivalves, which includes marine mussels.
A mussel; (now) especially one of the marine order Mytiloida.
Mid 19th century. From classical Latin mȳtilus Mytilus + -oid, perhaps after French mityloïde.
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