i Register
In some senses, cubitus is marked as archaic. Watch for register when choosing this word.
noun
The ulna.
One of the major veins of the insect wing, between the media and the postcubitus; the vein running along the dorsal edge of the discal cell.
The elbow, or the corresponding joint in the forelimb of a quadruped.
The forearm; the arm from the elbow to fingertip, or the corresponding portion of a jointed limb of an animal that uses the limb for locomotion or grasping.