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.

Source: Webster's Revised Unabridged Dictionary (1913)