Cu″bit (kū″bĭt), n. [L. cubitum, cubitus; elbow, ell, cubit, fr. (because the elbow serves for leaning upon) cubare to lie down, recline; cf. Gr. κύβιτον elbow, κύπτειν to bend, stoop, κυφόσ bent, stooping, humpbacked. Cf. Incumbent, Covey.] 1. (Anat.) The forearm; the ulna, a bone of the arm extending from elbow to wrist.
2. A measure of length, being the distance from the elbow to the extremity of the middle finger.
☞ The cubit varies in length in different countries, the Roman cubit being 17,47 inches, the Greek 18,20, the Hebrew somewhat longer, and the English 18 inches.