the thinner and longer of the two bones in the human forearm, on the side opposite to the thumb (人)尺骨。 比较 radius (义项2) ■the corresponding bone in a quadruped's foreleg or a bird's wing (鸟,兽)尺骨
派生 ulnar adjective 语源
late Middle English (denoting the humerus): from Latin; related to ell