GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Cubit , 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.]
   (Anat.) The forearm; the ulna, a bone of the arm extending from elbow to wrist. [Obs.]
   1913 Webster
   A measure of length, being the distance from the elbow to the extremity of the middle finger.
   1913 Webster
   ☞ 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.
   1913 Webster