ˈ ̷ ̷ˌ ̷ ̷ noun
Etymology: Middle English, from Old English sciellfisc, from sciell shell + fisc fish — more at shell , fish
1. : an aquatic invertebrate animal having a shell:
a. : an oyster, clam, or other mollusk
b. : a lobster or other crustacean
2. : boxfish