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
Cite this Entry
“Radio-ulna.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radio-ulna. Accessed 3 Nov. 2025.
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