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The Collaborative International Dictionary
Tricuspid

Tricuspid \Tri*cus"pid\, a. [L. tricuspis, -idis; tri- (see Tri-) + cuspis a point: cf. F. tricuspide.]

  1. Having three cusps, or points; tricuspidate; as, a tricuspid molar.

  2. (Anat.) Of or pertaining to the tricuspid valves; as, tricuspid obstruction.

    Tricuspid valve (Anat.), the valve, consisting of three triangular membranous flaps, at the opening of the right auricle into the right ventricle in the heart of most mammals; -- sometimes called the tricuspid valves, each flap being regarded as a valve.

Douglas Harper's Etymology Dictionary
tricuspid

1660s, from Latin tricuspidem (nominative tricuspis) "three-pointed," from tri- (see tri-) + cuspis "point" (see cusp).

Wiktionary
WordNet
tricuspid

adj. having three cusps or points (especially a molar tooth); "tricuspid molar"; "tricuspid valve" [syn: tricuspidate]

Wikipedia

Usage examples of "tricuspid".

The alien's short beak remained closed during the trip, which Corwin regretted: he'd have liked to have seen what Troft tricuspid teeth really looked like.

Burke exposed the tricuspid valve and began to remove the shredded membrane.