| n. | 1. | (Zool.) Any one of many species of marine bivalve shells of the genus Mytilus, and related genera, of the family | |||
| 2. | (Zool.) Any one of numerous species of Unio, and related fresh-water genera; - called also
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| Noun | 1. | mussel - black marine bivalves usually steamed in wine |
| 2. | mussel - marine or freshwater bivalve mollusk that lives attached to rocks etc. |