Source : Webster's Revised Unabridged Dictionary (1913)

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

Frill \Frill\, n. [See {Frill}, v. i.]. (Zo["o]l.)
   (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.

Source : WordNet®

frill
     n : a strip of pleated material used as a decoration or a trim
         [syn: {flounce}, {ruffle}, {furbelow}]