Coak

Definition:

(n.) See Coke, n.
(n.) A kind of tenon connecting the face of a scarfed timber with the face of another timber, or a dowel or pin of hard wood or iron uniting timbers.
(n.) A metallic bushing or strengthening piece in the center of a wooden block sheave.
(v. t.) To unite, as timbers, by means of tenons or dowels in the edges or faces.

Compare coak with other words:

coak vs. sheave

bearing vs. coak

coak vs. wooden