Loin \Loin\, n. [OE. loine, OF. logne, F. longe, from (assumed) LL. lumbea, L. lumbus join. Cf. Lends, Lumbar, Nombles.]

That part of a human being or quadruped, which extends on either side of the spinal column between the hip bone and the false ribs. In human beings the loins are also called the reins. See Illust. of Beef.

Source: Webster's Revised Unabridged Dictionary (1913)