cuspal

cusp

[kuhsp]
noun
1.
a point or pointed end.
2.
Anatomy, Zoology, Botany. a point, projection, or elevation, as on the crown of a tooth.
3.
Also called spinode. Geometry. a point where two branches of a curve meet, end, and are tangent.
4.
Architecture. a decorative device, used especially in Gothic architecture to vary the outlines of intradoses or to form architectural foils, consisting of a pair of curves tangent to the real or imaginary line defining the area decorated and meeting at a point within the area.
5.
Astronomy. a point of a crescent, especially of the moon.
6.
Astrology.
a.
the zodiacal degree that marks the beginning of a house or a sign.
b.
Informal. a person born on the first day of a sign.
7.
a point that marks the beginning of a change: on the cusp of a new era.

Origin:
1575–85; < Latin cuspis a point

cuspal, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
cusp (kʌsp)
 
n
1.  any of the small elevations on the grinding or chewing surface of a tooth
2.  any of the triangular flaps of a heart valve
3.  a point or pointed end
4.  geometry Also called: spinode a point at which two arcs of a curve intersect and at which the two tangents are coincident
5.  architect a carving at the meeting place of two arcs
6.  astronomy either of the points of a crescent moon or of a satellite or inferior planet in a similar phase
7.  astrology any division between houses or signs of the zodiac
 
[C16: from Latin cuspis point, pointed end]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

cusp
1580s, from L. cuspis "point, spear, pointed end." Astrological use is earliest.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

cusp (kŭsp)
n.

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

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

cuspal cusp·al (kŭs'pəl)
adj.
Relating to a cusp.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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