[in-ter-kos-tl, -kaw-stl]
pertaining to muscles, parts, or intervals between the ribs.
situated between the ribs.
Shipbuilding. noting a structural member situated between or divided by continuous members, as frames or keelsons.
an intercostal muscle, member, or space.

1590–1600; < Neo-Latin intercostālis. See inter-, costal

intercostally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
intercostal (ˌɪntəˈkɒstəl)
anatomy between the ribs: intercostal muscles
[C16: via New Latin from Latin inter- + costa rib]

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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American Heritage
Medical Dictionary

intercostal in·ter·cos·tal (ĭn'tər-kŏs'təl)
Located or occurring between the ribs. n.
A space, muscle, or part situated between the ribs.

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
He's battling an injured intercostal muscle on his right side.
The ribs are situated one below the other in such a manner that spaces called intercostal spaces are left between them.
The intercostal muscles are located in spaces between the ribs.
The intercostal muscles simultaneously relax, further decreasing the volume of the lungs.
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