Source : Webster's Revised Unabridged Dictionary (1913)

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

Source : WordNet®

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