radio-ulna
noun
ra·dio-ul·na
ˌrā-dē-ō-ˈəl-nə
variants
or radioulna
plural radio-ulnas or radioulnas
: a single bone in the forelimb of an amphibian (such as a frog) that represents fusion of the separate radius and ulna of higher vertebrate forms
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Merriam-Webster unabridged
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