Scal·lop n.  [Written also scollop.]
 1. Zool. Any one of numerous species of marine bivalve mollusks of the genus Pecten and allied genera of the family Pectinidae. The shell is usually radially ribbed, and the edge is therefore often undulated in a characteristic manner. The large adductor muscle of some the species is much used as food. One species (Vola Jacobaeus) occurs on the coast of Palestine, and its shell was formerly worn by pilgrims as a mark that they had been to the Holy Land. Called also fan shell. See Pecten, 2.
 Note: ☞ The common edible scallop of the Eastern United States is Pecten irradians; the large sea scallop, also used as food, is Pecten Clintonius syn. Pecten tenuicostatus.
 2. One of series of segments of circles joined at their extremities, forming a border like the edge or surface of a scallop shell.
 3. One of the shells of a scallop; also, a dish resembling a scallop shell.