tri·cus·pid (trī-kŭs'pĭd) 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')
Having three cusps, especially a molar tooth.
Of or relating to the tricuspid valve.
[From Latin tricuspis, tricuspid-, having three points : tri-, tri- + cuspis, point.]