Etymology
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scallop (n.)

"bivalve mollusk," c. 1400, from Old French escalope "shell (of a nut), carpace," variant of eschalope, probably from a Germanic source (compare Old Norse skalpr "sheath," Middle Dutch schelpe "shell"), from PIE root *skel- (1) "to cut." The shells of the larger species have been used as domestic utensils. Extended 17c. to objects shaped like scallop shells, especially in design and dress. The verb in the cookery sense, "to bake with sauce in a scallop shell-shaped pan," is attested from 1737. Related: Scalloped; scalloping.

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Definitions of scallop
1
scallop (v.)
decorate an edge with scallops;
the dress had a scalloped skirt
scallop (v.)
bake in a sauce, milk, etc., often with breadcrumbs on top;
Synonyms: escallop
scallop (v.)
form scallops in;
scallop the meat
Synonyms: scollop
scallop (v.)
fish for scallops;
Synonyms: scollop
scallop (v.)
shape or cut in scallops;
scallop the hem of the dress
Synonyms: scollop
2
scallop (n.)
one of a series of rounded projections (or the notches between them) formed by curves along an edge (as the edge of a leaf or piece of cloth or the margin of a shell or a shriveled red blood cell observed in a hypertonic solution etc.);
Synonyms: crenation / crenature / crenel / crenelle
scallop (n.)
edible muscle of mollusks having fan-shaped shells; served broiled or poached or in salads or cream sauces;
Synonyms: scollop / escallop
scallop (n.)
thin slice of meat (especially veal) usually fried or broiled;
Synonyms: cutlet / scollop / escallop
scallop (n.)
edible marine bivalve having a fluted fan-shaped shell that swim by expelling water from the shell in a series of snapping motions;
Synonyms: scollop / escallop
From wordnet.princeton.edu