cusp

nouns

point formed by two intersecting arcs (as from the intrados of a Gothic arch)

cusp

is derived from

is a type of (narrower)

sharp end

"he stuck the point of the knife into a tree"; "he broke the point of his pencil"

a thin triangular flap of a heart valve

cusp, leaflet

small elevation on the grinding surface of a tooth

cusp

is a part of

hard bonelike structures in the jaws of vertebrates; used for biting and chewing or for attack and defense

is a type of (narrower)

a V shape

"the cannibal's teeth were filed to sharp points"