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From Longman Dictionary of Contemporary English
Related topics: Human
ulnaul‧na /ˈʌlnə/ noun (plural ulnae /-niː/) [countable]  medicalHBH the inner bone of your lower arm, on the side opposite to your thumb
Examples from the Corpus
ulnaRight arm, compound spiral fractures or radius and ulna.Also in a remarkable state of preservation is a flute made h-am the ulna at Vulture.A shinbone was broken, twisted - as was the ulna in one arm, and several ribs.
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