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floating rib

noun, Anatomy
1.
one member of the two lowest pairs of ribs, which are attached neither to the sternum nor to the cartilages of other ribs.
Origin
1825-1835
1825-35
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for floating rib

floating rib

noun
1.
any rib of the lower two pairs of ribs in man, which are not attached to the breastbone
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
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floating rib in Medicine

floating rib n.
Any of the two lowest pairs of ribs with no anterior attachment to the sternum. Also called vertebral rib.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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12
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