The Collaborative International Dictionary of English v.0.48:

Croissant'e \Crois`san`t['e]"\ (krw?`s?n`t?"), a. [F. croissant,
   adj. & n., crescent.] (Her.)
   Terminated with crescents; -- said of a cross the ends of
   which are so terminated.
   [1913 Webster]