MyDataFarming

Definitions of cusp:

noun:   point formed by two intersecting arcs (as from the intrados of a Gothic arch)
noun:   small elevation on the grinding surface of a tooth
noun:   a thin triangular flap of a heart valve

more on this topic on answers.com

Alternative Terms
acicula acumination apex mucro point tip sharp-dull rip-current tracery gothic-architecture foil wiktionary cusp-singularity cusp-form cuspidal-representation cusp-dentistry cusps-of-heart-valves cusp-astrology cusp-novel beach-cusps cuspis triangular-ridges cuspidate cusp-of-the-first-kind cusp-of-the-second-kind cusp-angle unicuspid occlusal-unit cusp-fossa-relations depth-of-fossa keratoid-cusp-mathematics paracone paraconid ramphoid-cusp-mathematics