Mussel/ˈmʌsl/ Definition 1 of 3Pro Tip 1/3Culinary Term Refers to shellfish often used in seafood dishes, considered a delicacy. The chef specializes in preparing mussels with garlic and herbs. Pro Tip 2/3Menu Item Commonly found listed under appetizers or entrees in restaurants. Could you recommend a white wine to pair with the mussels? Pro Tip 3/3Allergy Warning People allergic to shellfish must avoid eating mussels due to severe reactions. Make sure the soup doesn't contain mussels; I'm allergic to shellfish.