'CUSP' definitions:

Definition of 'cusp'

noun

Point formed by two intersecting arcs (as from the intrados of a Gothic arch)

noun

A thin triangular flap of a heart valve [syn: cusp, leaflet]

noun

Small elevation on the grinding surface of a tooth

From: GCIDE

Cusp \Cusp\ (k[u^]sp), n. [L. cuspis, -idis, point, pointed end.] [1913 Webster]
1. (Arch.) A triangular protection from the intrados of an arch, or from an inner curve of tracery. [1913 Webster]
2. (Astrol.) The beginning or first entrance of any house in the calculations of nativities, etc. [1913 Webster]
3. (Astron) The point or horn of the crescent moon or other crescent-shaped luminary. [1913 Webster]
4. (Math.) A multiple point of a curve at which two or more branches of the curve have a common tangent. [1913 Webster]
5. (Anat.) A prominence or point, especially on the crown of a tooth. [1913 Webster]
6. (Bot.) A sharp and rigid point. [1913 Webster]

From: GCIDE

Cusp \Cusp\, v. t. [imp. & p. p. Cusped (k[u^]spt); p. pr. & vb. n. Cusping.] To furnish with a cusp or cusps. [1913 Webster] cuspate