Cubit
Pronunciation : Cu"bit (k"bt)
Part of Speech : n.
Etymology : [L. cubitum, cubitus; elbow, ell, cubit, fr. (because the elbow serves focubare to lie down, recline; cf. Gr. Incumbent, Covey.]
Definition : 1. (Anat.)
Defn: The forearm; the ulna, a bone of the arm extending from elbow to wrist. [Obs.]
2. A measure of length, being the distance from the elbow to the extremity of the middle finger.
Note: 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.
Source : Webster's Unabridged Dictionary, 1913