/ ˈʌlnə; NAmE / noun
( pl. ulnae / -niː; NAmE /) ( anatomy ) the longer bone of the two bones in the lower part of the arm between the elbow and the wrist, on the side opposite the thumb
—see also radius (3)—picture at skeleton
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WORD ORIGIN
late Middle English (denoting the humerus bone): from Latin ; related to ell .