cubital joint vs cubitus

cubital joint and cubitus both are nouns.

Word	Noun	Adjective	Verb	Adverb
cubital joint	Yes	No	No	No
cubitus	Yes	No	No	No

As nouns, cubital joint and cubitus are synonyms defined as:

cubital joint and cubitus: hinge joint between the forearm and upper arm and the corresponding joint in the forelimb of a quadruped

Other synonyms of cubital joint include articulatio cubiti, elbow, elbow joint, human elbow.

cubital joint (noun)	cubitus (noun)
hinge joint between the forearm and upper arm and the corresponding joint in the forelimb of a quadruped	hinge joint between the forearm and upper arm and the corresponding joint in the forelimb of a quadruped
	the arm from the elbow to the fingertips