Definition of: cusp

(kusp) noun
1. A point or pointed end.
2. Astron. Either point of a crescent moon.
3. Geom. A point at which two branches of a curve meet and end, with a common tangent.
4. Archit. A projecting point between small arcs, as in medieval tracery.
5. Anat. a A prominence or point, as on the crown of a tooth. b The pointed fold forming a segment of the cardiac valves.
6. Bot. A sharp, stiff point, as of a leaf.
7. In astrology, the first entrance of a house in the determination of nativities.
8. Geol. An angular, projecting beach or portion of a beach, formed by the interaction of conflicting currents. [<L cuspis, -idis a point]