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ulna (n.)

inner bone of the forearm, 1540s, medical Latin, from Latin ulna "the elbow," also a measure of length, from PIE *el-ina-, extended form of root *el- "elbow, forearm." Related: Ulnar.

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Definitions of ulna from WordNet

ulna (n.)
the inner and longer of the two bones of the human forearm;
Synonyms: elbow bone
From wordnet.princeton.edu