A pointed or rounded projection on the crown of a tooth. A cusp may be present additional to the normal crown morphology (supplemental cusp). The cusp angle is the angle made by the slope of the cusp and a vertical line bisecting the cusp, measured mesiodistally or buccolingually. A stamp cusp is a functional cusp that stamps into the fossa of an opposing tooth. The stamp cusps of a lower premolar may have its tip in an embrasure and have only the cusp shoulders in small fossae. See also talon.