Merriam-Webster's Collegiate® Dictionary, 11th Edition
SCALLOP
I. noun also scollop
Etymology: Middle English scalop, from Anglo-French escalope shell, of Germanic origin; akin to Middle Dutch schelpe shell
Date: 15th century
1. 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, the adductor muscle of a scallop as an article of food,
2. a valve or shell of a scallop, a baking dish shaped like a valve of a scallop, one of a continuous series of circle segments or angular projections forming a border (as on cloth or metal), pattypan , a thin slice of boneless meat or fish ,
II. verb also scollop
Date: 1682
transitive verb
1. to shape, cut, or finish in scallops, to form scallops in, to bake in a sauce usually covered with seasoned bread or cracker crumbs , intransitive verb to gather or dredge scallops