The Collaborative International Dictionary of English v.0.48:

Fondant \Fon"dant\ (f[o^]n"dant; Fr. f[^o]N`d[aum]N"), n. [F.,
   lit., melting, p. pr. of fondre to melt, L. fundere. See
   Found to cast.]
   A kind of soft candy, made of a thick creamy sugar paste by
   boiling solutions to the point of crystallization, and
   usually molded; as, cherry fondant.
   [Webster 1913 Suppl. + WordNet 1.5]

WordNet (r) 3.0 (2006):

fondant
    n 1: candy made of a thick creamy sugar paste