forearm the part of the superior limb between the elbow and the wrist
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Wiktionary
Substantiv
ulna -
The bone of the forearm that extends from the elbow to the wrist on the side opposite to the thumb, corresponding to the fibula of the hind limb. Also, the corresponding bone in the forelimb of any vertebrate.
Wikipedia
The ulna is one of the two long bones in the forearm, prismatic in form. In anatomical position the ulna is placed at the medial side of the forearm closest to the body, parallel with the radius on both arms.
OmegaWiki Dictionary
Ω
ulna The smaller of the two bones of the forearm, that connects to the wrist on the side opposite to the thumb.