noun, plural cavities.
any hollow place; hollow.
Anatomy. a hollow space within the body, an organ, a bone, etc.
a hollow space or a pit in a tooth, most commonly produced by caries. A cavity may be artificially made to support dental restorations.

1535–45; < Middle French cavite < Late Latin cavitās hollowness, equivalent to Latin cav(us) hollow + -itās -ity

cavitied, adjective
subcavity, noun, plural subcavities.
uncavitied, adjective

1. See hole. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cavity (ˈkævɪtɪ)
n , pl -ties
1.  a hollow space; hole
2.  dentistry See caries a soft decayed area on a tooth
3.  any empty or hollow space within the body: the oral cavity
4.  electronics See cavity resonator
[C16: from French cavité, from Late Latin cavitās, from Latin cavus hollow]

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

1540s, from M.Fr. cavité, from L.L. cavitas "hollowness," from L. cavus "hollow" (see cave).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

cavity cav·i·ty (kāv'ĭ-tē)

  1. A hollow area within the body, such as a sinus cavity.

  2. A pitted area in a tooth caused by caries.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
cavity   (kāv'ĭ-tē)  Pronunciation Key 
  1. A hollow; a hole.

  2. A hollow area within the body.

  3. A pitted area in a tooth caused by caries.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
They then filled the spinal cavity around the injured area with blocks of
  hydrogel laced with stem cells from rat bone marrow.
X-rays may be taken yearly to detect possible cavity development in high risk
  areas of the mouth.
From there, the surgeon cuts a hole in the stomach wall to enter the abdominal
  cavity and perform the operation.
Mated pairs migrate to and breed in the northern parts of their range and build
  nests on the ground or in a protected cavity.
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