ulna

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ul·na / ˈəlnə/ • n. (pl. -nae / -ˌnē; -ˌnī/ or -nas ) the thinner and longer of the two bones in the human forearm, on the side opposite to the thumb. Compare with radius (sense 2). ∎  the corresponding bone in a quadruped's foreleg or a bird's wing. DERIVATIVES: ul·nar adj.

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ulna Long bone of the inner side of the forearm. At its upper end it articulates with the humerus in the upper arm and with the radius in the forearm.

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ulna The larger of the two bones in the forearm of vertebrates (compare radius). It articulates with the outer carpals at the wrist and with the humerus at the elbow.

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ulna (ul-nă) n. the inner and longer bone of the forearm. It articulates with the humerus and radius above and with the radius and indirectly with the wrist bones below.
ulnar (ul-ner) adj.

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ulna In tetrapods, the longer and thicker of the two bones of the fore limb; its upper end articulates with the humerus.

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ulna (anat.) larger inner bone of the forearm. XVI. — L. ulna forearm, ELL.
Hence ulnar XVIII.

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ulna In tetrapods (Tetrapoda), the post-axial bone of the fore limb.

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ulna: see arm.