The Collaborative International Dictionary of English v.0.48:

Coquette \Co*quette"\, n. [F., fr. coquet, coquette, coquettish,
   orig., cocklike, strutting like a cock, fr. coq a cock. Cf.
   Cock, Cocket, Cocky, Cockade.]
   1. A vain, trifling woman, who endeavors to attract
      admiration from a desire to gratify vanity; a flirt; --
      formerly sometimes applied also to men.
      [1913 Webster]

   2. (Zool.) A tropical humming bird of the genus Lophornis,
      with very elegant neck plumes. Several species are known.
      See Illustration under Spangle, v. t.
      [1913 Webster]

WordNet (r) 3.0 (2006):

coquette
    n 1: a seductive woman who uses her sex appeal to exploit men
         [syn: coquette, flirt, vamp, vamper, minx,
         tease, prickteaser]
    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]