Ulna (noun)

1. The inner and longer of the two bones in the human forearm, on the side of the little finger.
2. The corresponding bone in the forelimb of other vertebrates.

Origin:

The word ulna is derived from the latin word "ulna" which means "elbow" or "the arm bone on the side of the little finger".

Examples:

1. The ulna was broken in the fall.
2. The doctor examined the x-ray and confirmed a fracture of the ulna.
3. The ulna and the radius are the two bones in the forearm.
4. The ulna is parallel to the radius in the supinated position of the hand.
5. The ulna articulates with the humerus at the elbow joint.