noun the joint of a plant.
2. knuckle ·vt to beat with the knuckles; to pommel.
3. knuckle ·noun the joining pars of a hinge through which the pin or rivet passes; a knuckle joint.
4. knuckle ·noun the joint of a finger, particularly when made prominent by the closing of the fingers.
5. knuckle ·vi to yield; to submit;
used with down, to, or under.
6. knuckle ·noun the kneejoint, or middle joint, of either leg of a quadruped, especially of a calf;
formerly used of the kneejoint of a human being.
7. knuckle ·noun a convex portion of a vessel's figure where a sudden change of shape occurs, as in a canal boat, where a nearly vertical side joins a nearly flat bottom.
8. knuckle ·noun a contrivance, usually of brass or iron, and furnished with points, worn to protect the hand, to add force to a blow, and to disfigure the person struck; as, brass knuckles;
called also knuckle duster.