Breast-bone

breastbone

[brest-bohn]
noun
the sternum.

Origin:
before 1000; Middle English brust-bon, Old English brēostbān. See breast, bone1

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Collins
World English Dictionary
breastbone (ˈbrɛstˌbəʊn)
 
n
the nontechnical name for sternum

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

breastbone
"sternum," O.E. breostban, from breast + bone.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
breastbone   (brěst'bōn')  Pronunciation Key 
See sternum.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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