tri·cus·pid 
(trī-kŭspĭd)
(trī-kŭspĭd)n.
An organ or part, especially a tooth, having three cusps.
adj. also tri·cus·pi·dal (-pĭ-dəl) or tri·cus·pi·date (-pĭ-dāt′)
1. Having three cusps, especially a molar tooth.
2. Of or relating to the tricuspid valve.
[From Latin tricuspis, tricuspid-, having three points : tri-, tri- + cuspis, point.]