Tenon

n.	1.	(Carp. & Join.) A projecting member left by cutting away the wood around it, and made to insert into a mortise, and in this way secure together the parts of a frame; especially, such a member when it passes entirely through the thickness of the piece in which the mortise is cut, and shows on the other side. Cf. Tooth, Tusk. Tenon saw a saw with a thin blade, usually stiffened by a brass or steel back, for cutting tenons. - Gwilt.
v. t.	1.	To cut or fit for insertion into a mortise, as the end of a piece of timber.

Noun

1.

tenon - a projection at the end of a piece of wood that is shaped to fit into a mortise and form a mortise joint

mortise joint, mortise-and-tenon joint, projection