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. [1913 Webster]
A metallic bushing or strengthening piece in the center of a wooden block sheave. [1913 Webster]
coak, v. t.
To unite, as timbers, by means of tenons or dowels in the edges or faces. Totten. [1913 Webster]