escallop (n.)

"scallop shell," also "edge or border cut in the shape of scallops," late 15c., from Middle French escalope "shell," Old French eschalope "shell (of a nut), carapace," from a Germanic source (see scallop). For initial e-, see e-. As a verb from c. 1600 in escalloped "having the border or edge cut out in scallops."