The Collaborative International Dictionary of English v.0.48:

Cusp \Cusp\, v. t. [imp. & p. p. Cusped (k[u^]spt); p. pr. &
   vb. n. Cusping.]
   To furnish with a cusp or cusps.
   [1913 Webster] cuspate

The Collaborative International Dictionary of English v.0.48:

cuspate \cuspate\ cusped \cusped\adj.
   having cusps or points.

   Syn: cuspated, cuspidal, cuspidate, cuspidated.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

cusped
    adj 1: having cusps or points [syn: cuspate, cuspated,
           cusped, cuspidal, cuspidate, cuspidated]