: any of numerous marine bivalve lamellibranch mollusks (family Pectinidae) that have a radially ribbed shell with the edge undulated and that swim by opening and closing the valves
b
: the adductor muscle of a scallop as an article of food
2
a
: a valve or shell of a scallop
b
: a baking dish shaped like a valve of a scallop
3
: one of a continuous series of circle segments or angular projections forming a border (as on cloth or metal)