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1. (n.) ulna
the bone of the forearm on the side opposite to the thumb.
2. ulna
a corresponding bone in the forelimb of other vertebrates.
Etymology: (1835–45; < L: elbow; akin to Gk ōlénē, OE elnell2)
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| Definition of 'ulna' |
Princeton's WordNet |
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1. (noun) ulna, elbow bone
the inner and longer of the two bones of the human forearm
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| Definition of 'ulna' |
Webster Dictionary |
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1. (noun) ulna
the postaxial bone of the forearm, or branchium, corresponding to the fibula of the hind limb. See Radius
2. (noun) ulna
an ell; also, a yard
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Definitions of ulna 
