Edible marine bivalve having a fluted fan-shaped shell that swim by expelling water from the shell in a series of snapping motions WordNet 3.0 & Open English WordNet

Scallop is a common name that encompasses various species of marine bivalve mollusks in the taxonomic family Pectinidae, the scallops. Wikipedia

Name applied to numerous species of saltwater clams or marine bivalve mollusks in the Pectinidae family, the scallops. The common name scallop is also applied to species in other families of the superfamily Pectinoidea, including the thorny oysters. Wikidata

Family of molluscs Wikidata

A scallop. Wiktionary

Any of various marine bivalve molluscs of the family Pectinidae which are free-swimming. Wiktionary