Source : Webster's Revised Unabridged Dictionary (1913)

Prude \Prude\, n. [F., prudish, originally, discreet, modest;
   shortened from OF. prudefeme, preudefeme, a discreet or
   excellent woman; OF. preu, prou, excellent, brave + de of +
   fete woman. See {Prow}, a., {Prowess}.]
   A woman of affected modesty, reserve, or coyness; one who is
   overscrupulous or sensitive; one who affects extraordinary
   prudence in conduct and speech.

         Less modest than the speech of prudes.   --Swift.

Source : WordNet®

prude
     n : a person excessively concerned about propriety and decorum
         [syn: {puritan}]