con·cav·i·ty

[kon-kav-i-tee]
noun, plural con·cav·i·ties 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

sub·con·cav·i·ty, noun, plural sub·con·cav·i·ties.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
concavity (kɒnˈkævɪtɪ) [Click for IPA pronunciation guide]
 
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
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00:10
Concavity is always a great word to know.
So is gobo. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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
Understand points of inflection as places where concavity changes.
The recurrent branches arise from the concavity of the deep volar arch.
The lateral surface is convex in adaptation to the concavity of the corresponding half of the vault of the cranium.
The membrane is concave outward, and the point of deepest concavity-the umbo-is slightly below the center.
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