8 Words That Are Older Than You Think
tricuspid tri·cus·pid (trī-kŭs'pĭd)
An organ or a part, especially a tooth, having three cusps. adj. or tri·cus·pi·dal (-pĭ-dəl) or tri·cus·pi·date (-pĭ-dāt')
Having three points, prongs, or cusps.
Of or relating to the tricuspid valve.
Adjective Having three points or cusps.