What is the medical term meaning bone of lower arm?

The medical term for the bone of the lower arm is the ulna. It is one of the two bones that make up the forearm, along with the radius. The ulna is located on the medial side of the forearm, and it is slightly longer than the radius. The ulna articulates with the humerus at the elbow joint, and it also articulates with the wrist bones at the wrist joint.