a longitudinal vein in the rear portion of the wing of an insect.
Now Rare. the ulna.
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How to use cubitus in a sentence
A coronet or semicoronet of spines, observable at the apex of the cubitus or Tibia of some insects.An Introduction to Entomology: Vol. III (of 4) | William Kirby
Hypotenuses: in Odonata; the simple or broken cross-vein between media 4, and cubitus 1, forming outer boundary of triangle.Explanation of Terms Used in Entomology | John. B. Smith
When this angle is increased, the attitude is described as one of cubitus valgus.Manual of Surgery Volume Second: Extremities--Head--Neck. Sixth Edition. | Alexander Miles
Wings very long, and very narrow, the humerus and cubitus extremely elongated; first quill longest.A Synopsis of the Birds of North America | John James Audubon
The cubitus or Ulna is endu'd with two sorts of Motions, viz.The Compleat Surgeon, or the Whole Art of Surgery Explain'd in a Most Familiar Method | Charles Gabriel Le Clerc