The Collaborative International Dictionary of English v.0.48:

Cuspidal \Cus"pi*dal\ (-p?-dal), a. [From L. cuspis, cuspidis.
   See Cusp.]
   Ending in a point.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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