cusp

cusp  (ksp)

n.

1. A point or pointed end.

2. Anatomy

a. A pointed or rounded projection on the chewing surface of a tooth.

b. A triangular fold or flap of a heart valve.

3. Mathematics A point at which a curve crosses itself and at which the two tangents to the curve coincide.

4. Architecture The point of intersection of two ornamental arcs or curves, such as the inner points of a trefoil.

5. Astronomy Either point of a crescent moon.

6. A transitional point or time, as between two astrological signs.

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[Latin cuspis, point.]

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cusp

Noun

1. a small point on the grinding or chewing surface of a tooth

2. a point where two curves meet

3. Astrol any division between houses or signs of the zodiac

4. Astron either of the points of a crescent moon [Latin cuspis pointed end]

Thesaurus

Noun	1.	cusp - point formed by two intersecting arcs (as from the intrados of a Gothic arch) point - sharp end; "he stuck the point of the knife into a tree"; "he broke the point of his pencil"
	2.	cusp - a thin triangular flap of a heart valve leaflet flap - a movable piece of tissue partly connected to the body cardiac valve, heart valve - a valve to control one-way flow of blood
	3.	cusp - small elevation on the grinding surface of a tooth tooth - hard bonelike structures in the jaws of vertebrates; used for biting and chewing or for attack and defense tip, peak, point - a V shape; "the cannibal's teeth were filed to sharp points"