accessory bone
Oxford Dictionary of Sports Science & Medicine:
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accessory bone
supernumerary bone
A bone, such as the os trigonum, not present in all people, that develops from a separate centre of ossification from the parent bone to which it may or may not be joined.
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Oxford Dictionary of Sports Science & Medicine
The Oxford Dictionary of Sports Science & Medicine. Copyright © Michael Kent 1998, 2006, 2007. All rights reserved.
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