n.1 an apex or peak.
2 the horn of a crescent moon etc.
3 Astrol. the initial point of a house.
4 Archit. a projecting point between small arcs in Gothic tracery.
5 Geom. the point at which two arcs meet from the same direction terminating with a common tangent.
6 Bot. a pointed end, esp. of a leaf.
7 a cone-shaped prominence on the surface of a tooth esp. a molar or premolar.
8 a pocket or fold in a valve of the heart.
Derivatives:
cuspate adj. cusped adj. cuspidal adj.
Etymology: L cuspis, -idis point, apex