Source : Webster's Revised Unabridged Dictionary (1913)

Confidant \Con`fi*dant"\; 277), n. masc., Confidante
\Con`fi*dante"\ (?; 277), n. fem.[F. confident, confidente,
   formerly also spelt confidant, confidante. See {Confide}, and
   cf. {Confident}.]
   One to whom secrets, especially those relating to affairs of
   love, are confided or intrusted; a confidential or bosom
   friend.

         You love me for no other end Than to become my
         confidant and friend; As such I keep no secret from
         your sight.                              --Dryden.

Source : WordNet®

confidante
     n : a female confidant