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breastbone

[brest-bohn] /ˈbrɛstˌboʊn/
noun
1.
the sternum.
Origin
1000
before 1000; Middle English brust-bon, Old English brēostbān. See breast, bone1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for breast bone

breastbone

/ˈbrɛstˌbəʊn/
noun
1.
the nontechnical name for sternum
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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Word Origin and History for breast bone

breastbone

n.

"sternum," Old English breostban; see breast (n.) + bone (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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breast bone in Medicine

breastbone breast·bone (brěst'bōn')
n.
See sternum.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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breast bone in Science
breastbone
  (brěst'bōn')   
See sternum.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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8
9
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