The Collaborative International Dictionary of English v.0.48:

frill \frill\ (fr[i^]l), v. i. [imp. & p. p. frilled
   (fr[i^]ld); 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.
      [1913 Webster]

   2. (Photog.) To wrinkle; -- said of the gelatin film.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Frill \Frill\, v. t.
   To provide or decorate with a frill or frills; to turn back.
   in crimped plaits; as, to frill a cap.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Frill \Frill\, n. [See Frill, v. i.]. (Zool.)
   (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.
       [1913 Webster]

   2. A border or edging secured at one edge and left free at
      the other, usually fluted or crimped like a very narrow
      flounce.
      [1913 Webster]

   3. Hence: Something superfluous, such as an ornament, or an
      additional function on a device or in a system not
      essential to the basic operation. -- Commonly used in the
      phrase no frills, used adjectively to indicate a fully
      functional but economical device or service; as, an
      economical no-frills airline.
      [PJC]

WordNet (r) 3.0 (2006):

frill
    n 1: (paleontology) a bony plate that curves upward behind the
         skull of many ceratopsian dinosaurs
    2: an external body part consisting of feathers or hair about
       the neck of a bird or other animal [syn: frill, ruff]
    3: a strip of pleated material used as a decoration or a trim
       [syn: frill, flounce, ruffle, furbelow]
    4: ornamental objects of no great value [syn: folderal,
       falderol, frill, gimcrackery, gimcrack, nonsense,
       trumpery]