cubitus vs ulna

cubitus

noun
  • 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. 

  • The elbow, or the corresponding joint in the forelimb of a quadruped. 

  • 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. 

ulna

noun
  • The bone of the forearm that extends from the elbow to the wrist on the side opposite to the thumb, corresponding to the fibula of the hind limb. Also, the corresponding bone in the forelimb of any vertebrate. 

How often have the words cubitus and ulna occurred in a corpus of books? (source: Google Ngram Viewer )