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cusp

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The definition of a cusp is a point, peak or tip.

(noun)

An example of a cusp is the top of a hill.

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See cusp in Webster's New World College Dictionary

noun

a point or pointed end; apex; peak
Anat.
1. any of the elevations on the chewing surface of a tooth
2. any of the triangular flaps of a heart valve
Archit. a projecting point where two arcs meet, as in the internal curve of an arc
Astrol. the transitional part of a sign or house
Astron. either horn of a crescent, as of the moon
Geom. the tip of a pointed curve

Origin: L cuspis (gen. cuspidis), point, pointed end, spear

See cusp in American Heritage Dictionary 4

cusp

noun

A point or pointed end.
Anatomy
a. A pointed or rounded projection on the chewing surface of a tooth.
b. A triangular fold or flap of a heart valve.
Mathematics A point at which a curve crosses itself and at which the two tangents to the curve coincide.
Architecture The point of intersection of two ornamental arcs or curves, such as the inner points of a trefoil.
Astronomy Either point of a crescent moon.
A transitional point or time, as between two astrological signs.

Origin: Latin cuspis, point.

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