Merriam-Webster Collegiate Dictionary - pastern

 noun  Etymology: Middle French pasturon, from pasture ~, from Old French empasturer to hobble (a horse), from pasture tether, modification of Late Latin (chorda) pastoria, from Latin, feminine of pastorius of a herdsman, from pastor herdsman — more at pastor  Date: circa 1530  1. a part of the foot of an equine extending from the fetlock to the top of the hoof — see horse illustration  2. a part of the leg of an animal other than an equine that corresponds to the ~