concavity

[kon-kav-i-tee]
noun, plural concavities for 2.
1.
the state or quality of being concave.
2.
a concave surface or thing; cavity.

Origin:
1350–1400; Middle English concavite < Late Latin concavitāt- (stem of concavitās). See con-, cave, -ity

subconcavity, noun, plural subconcavities.
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Collins
World English Dictionary
concavity (kɒnˈkævɪtɪ)
 
n , pl -ties
1.  the state or quality of being concave
2.  a concave surface or thing; cavity

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

concavity
late 15c., from Fr. concavité (14c.), from L. concavitas, from concavus "hollow" (see concave).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

concavity con·cav·i·ty (kŏn-kāv'ĭ-tē)
n.
A hollow or depression that is curved like the inner surface of a sphere.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The membrane is concave outward, and the point of deepest concavity-the umbo-is slightly below the center.
The lateral surface is convex in adaptation to the concavity of the corresponding half of the vault of the cranium.
The recurrent branches arise from the concavity of the deep volar arch.
Understand points of inflection as places where concavity changes.
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