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]

Moby Thesaurus II by Grady Ward, 1.0:

144 Moby Thesaurus words for "frill":
   addition, adornment, amenity, beading, beauties, bedizenment,
   binding, bonus, bordering, bordure, bravery, chiffon, clinquant,
   colors, colors of rhetoric, crease, creasing, crimp, crisp,
   decoration, dog-ear, double, double over, doubling, duplication,
   duplication of effort, duplicature, edging, elegant variation,
   embellishment, embroidery, enfold, expletive, extra,
   extra added attraction, extra dash, extravagance, fat,
   featherbedding, festoons, figure, figure of speech, filigree,
   filling, fillip, fimbria, fimbriation, fine writing, finery,
   flection, flexure, floridity, floridness, flounce, flourish,
   floweriness, flowers of speech, flute, fold, fold over, folderol,
   foofaraw, frilliness, frilling, frills, frills and furbelows,
   fringe, frippery, froufrou, furbelow, fuss, gaiety, galloon,
   gather, gaudery, gewgaw, gilding, gilt, gingerbread, hem, infold,
   interfold, jazz, lagniappe, lap over, lapel, lappet, list,
   lushness, luxuriance, luxury, motif, needlessness, ornament,
   ornamentation, ostentation, overadornment, overlap, padding, paste,
   payroll padding, pinchbeck, plait, plat, pleat, pleonasm, plica,
   plicate, plication, plicature, ply, premium, prolixity,
   purple patches, quill, redundance, redundancy, ruche, ruching,
   ruff, ruffle, selvage, showiness, skirting, something extra,
   stuffing, superaddition, superfluity, superfluousness, tautology,
   tinsel, trappings, trickery, trimming, trumpery, tuck, turn over,
   twill, twist, unnecessariness, valance, verbosity, welt, wrinkle