The Collaborative International Dictionary of English v.0.48:

Flirt \Flirt\, v. t. [imp. & p. p. Flirted; p. pr. & vb. n.
   Flirting.] [Cf. AS. fleard trifle, folly, fleardian to
   trifle.]
   1. To throw with a jerk or quick effort; to fling suddenly;
      as, they flirt water in each other's faces; he flirted a
      glove, or a handkerchief.
      [1913 Webster]

   2. To toss or throw about; to move playfully to and fro; as,
      to flirt a fan.
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   3. To jeer at; to treat with contempt; to mock. [Obs.]
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            I am ashamed; I am scorned; I am flirted. --Beau. &
                                                  Fl.
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The Collaborative International Dictionary of English v.0.48:

Flirt \Flirt\, v. i.
   1. To run and dart about; to act with giddiness, or from a
      desire to attract notice; especially, to play the
      coquette; to play at courtship; to coquet; as, they flirt
      with the young men.
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   2. To utter contemptuous language, with an air of disdain; to
      jeer or gibe. [Obs.] --Beau. & Fl.
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The Collaborative International Dictionary of English v.0.48:

Flirt \Flirt\, n.
   1. A sudden jerk; a quick throw or cast; a darting motion;
      hence, a jeer.
      [1913 Webster]

            Several little flirts and vibrations. --Addison.
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            With many a flirt and flutter.        --E. A. Poe.
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   2. [Cf. LG. flirtje, G. flirtchen. See Flirt, v. t.] One
      who flirts; esp., a woman who acts with giddiness, or
      plays at courtship; a coquette; a pert girl.
      [1913 Webster]

            Several young flirts about town had a design to cast
            us out of the fashionable world.      --Addison.
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The Collaborative International Dictionary of English v.0.48:

Flirt \Flirt\, a.
   Pert; wanton. [Obs.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

flirt
    n 1: a seductive woman who uses her sex appeal to exploit men
         [syn: coquette, flirt, vamp, vamper, minx,
         tease, prickteaser]
    2: playful behavior intended to arouse sexual interest [syn:
       flirt, flirting, flirtation, coquetry, dalliance,
       toying]
    v 1: talk or behave amorously, without serious intentions; "The
         guys always try to chat up the new secretaries"; "My
         husband never flirts with other women" [syn: chat up,
         flirt, dally, butterfly, coquet, coquette,
         romance, philander, mash]
    2: behave carelessly or indifferently; "Play about with a young
       girl's affection" [syn: dally, toy, play, flirt]

Moby Thesaurus II by Grady Ward, 1.0:

164 Moby Thesaurus words for "flirt":
   Circe, Don Juan, Lorelei, Parthenope, Siren, Sunday painter,
   allure, amateur, bait, bait the hook, beak, blandish, bob, brush,
   bunt, cajole, captive, cast coquettish glances, catch, charmer,
   chuck, coax, conquest, consider, contemplate, coquet, coquette,
   dab, dabble, dabbler, dallier, dally, date, decoy, dilettante,
   draw, draw in, draw on, enchanter, enchantress, ensnare, entertain,
   entice, enticer, eye, femme fatale, fiddle, fiddle with,
   fiddle-faddle, fidget with, fillip, finger with, flick, flip,
   flirt with, flounce, fool, fool around, fool with, fribble, frivol,
   gallivant, give the come-on, gold digger, gold-dig, graze, hitch,
   honey, horse around, hussy, idle, inveigle, inveigler, jerk,
   jerk off, jig, jigger, jigget, jiggle, jog, joggle, kid around,
   lady-killer, lead on, loiter, look sweet upon, lounge lizard, lure,
   make eyes at, masher, mess around, minx, monkey, monkey around,
   offer bait to, ogle, pat, peck, pet, philander, philanderer, pick,
   piddle, piddler, play, play around, play with, playboy, pluck,
   potter, potterer, putter, putterer, rap, rope in, run around,
   seduce, seducer, seductress, sheik, siren, smatter, smatterer,
   snake, snap, snatch, start, steady, string, strumpet, suck in,
   sudden pull, sweet patootie, sweetheart, sweetie, tantalize, tap,
   tease, teaser, tempter, temptress, think about, think of, tickle,
   tinker, tip, touch, toy, toy with, trifle, trifle with, trifler,
   tweak, twiddle, twitch, vamp, vampire, whisk, whore, wolf, woo,
   wrench, yank, yerk