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. cuspate adj. cusped adj. cuspidal adj.
[ L cuspis, -idis point, apex ]