Cusp may refer to: Cusp (singularity), a singular point of a curveCusp catastropheCusp form in modular form theoryCuspidal representation, a generalization of cusp forms in the theory of automorphic representationsCusp (dentistry), a pointed structure on a cuspid, premolar, or molarCusps of heart valves, leaflets of a heart valveCusp (astrology), a boundary between zodiac signs and housesCusp (novel), a science fiction story by Robert A. MetzgerBeach cusps, a pointed and regular arc pattern of t… (More on Cusp)