- a point or pointed end.
- Anatomy, Zoology, Botany. a point, projection, or elevation, as on the crown of a tooth.
- Also called spinode. Geometry. a point where two branches of a curve meet, end, and are tangent.
- 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.
- Astronomy. a point of a crescent, especially of the moon.
- the zodiacal degree that marks the beginning of a house or a sign.
- Informal.a person born on the first day of a sign.
- a point that marks the beginning of a change: on the cusp of a new era.
Origin of cusp
First recorded in 1575–85, cusp is from the Latin word cuspis a point
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- any of the small elevations on the grinding or chewing surface of a tooth
- any of the triangular flaps of a heart valve
- a point or pointed end
- Also called: spinode geometry a point at which two arcs of a curve intersect and at which the two tangents are coincident
- architect a carving at the meeting place of two arcs
- astronomy either of the points of a crescent moon or of a satellite or inferior planet in a similar phase
- astrology any division between houses or signs of the zodiac
Word Origin for cusp
C16: from Latin cuspis point, pointed end
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
1580s, from Latin cuspis "point, spear, pointed end, head," of unknown origin. Astrological use is earliest.
Online Etymology Dictionary, © 2010 Douglas Harper
- Relating to a cusp.
- A pointed or rounded projection on the chewing surface of a tooth.
- A triangular fold or flap of a heart valve.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.