cusp

cusp

noun \ˈkəsp\

Definition of CUSP

: point, apex: as a : a point of transition (as from one historical period to the next) : turning point; also : edge, verge <on the cusp of stardom> b : either horn of a crescent moon c : a fixed point on a mathematical curve at which a point tracing the curve would exactly reverse its direction of motion d : an ornamental pointed projection formed by or arising from the intersection of two arcs or foils e (1) : a point on the grinding surface of a tooth (2) : a fold or flap of a cardiac valve

— cus·pate \ˈkəs-ˌpāt, -pət\ adjective

— cusped \ˈkəspt\ adjective

Examples of CUSP

1. the cusp of a tooth
2. <medical researchers who are on the cusp of a major breakthrough>

Illustration of CUSP

Origin of CUSP

Latin cuspis point

First Known Use: 1585

Related to CUSP

Synonyms: brink, point, edge, threshold, verge

Related Words: nick

see all synonyms and antonyms

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