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]