What is the kneejoint, or middle joint, of either leg of a quadruped, especially of a calf; -- formerly used of the kneejoint of a human being. With weary knuckles on thy brim she kneeled sadly down. Golding called?

knuckle — The kneejoint, or middle joint, of either leg of a quadruped, especially of a calf; -- formerly used of the kneejoint of a human being. With weary knuckles on thy brim she kneeled sadly down. Golding. (Webster's 1913.)