Scallop \Scal"lop\, v. t. [imp. & p. p. Scalloped; p. pr. & vb. n. Scalloping.]

1. To mark or cut the edge or border of into segments of circles, like the edge or surface of a scallop shell. See Scallop, n., 2.

2. (Cookery) To bake in scallop shells or dishes; to prepare with crumbs of bread or cracker, and bake. See Scalloped oysters, below.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Scalloped \Scal"loped\, a.

1. Furnished with a scallop; made or done with or in a scallop.

2. Having the edge or border cut or marked with segments of circles. See Scallop, n., 2.

3. (Cookery) Baked in a scallop; cooked with crumbs.

Scalloped oysters (Cookery), opened oysters baked in a deep dish with alternate layers of bread or cracker crumbs, seasoned with pepper, nutmeg, and butter. This was at first done in scallop shells.

Source: Webster's Revised Unabridged Dictionary (1913)