Frill (?), v. i. [imp. & p. p. Frilled (?); p. pr. & vb. n. Frilling.] [OF. friller, fr. L. frigidulus somewhat cold, dim. of frigidus cold; akin to F. frileux chilly.] 1. To shake or shiver as with cold; as, the hawk frills. Johnson.

2. (Photog.) To wrinkle; -- said of the gelatin film.

Frill, v. t. To provide or decorate with a frill or frills; to turn back. in crimped plaits; as, to frill a cap.

Frill, n. [See Frill, v. i.]. (Zoöl.) (a) A ruffing of a bird's feathers from cold. (b) A ruffle, consisting of a fold of membrane, of hairs, or of feathers, around the neck of an animal. See Frilled lizard (below). (c) A similar ruffle around the legs or other appendages of animals. (d) A ruffled varex or fold on certain shells.

2. A border or edging secured at one edge and left free at the other, usually fluted or crimped like a very narrow flounce.