The cubit is an archaic unit of length based on the length of the forearm from the elbow to the tip of the middle finger. Cubits of various lengths were employed in many parts of the world in antiquity, during the Middle Ages and as recently as Early Modern Times. The term is still used in hedge laying, the length of the forearm being frequently used to determine the interval between stakes placed within the hedge.
Other units of measure based on the length of the forearm include some kinds of ell, the Indian Hasta, Khmer hat and Thai sok.
The English word "cubit" comes from the Latin noun cubitum "elbow", from the verb cubo, cubare, cubui, cubitum "to lie down", from which also comes the adjective "recumbent".