n.
Pronunciation: ' k ə sp
Function: noun
Etymology: Latin cuspis point
Date: 1585
: 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 \ ' k ə s- ˌ p ā t, -p ə t \ adjective
– cusped \ ' k ə spt \ adjective
cusp