tenon

noun

Etymology: From Middle English tenoun, tenown, tenon, from Anglo-Norman tenoun, from Old French tenon.

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.
“A keyed mortise-and-tenon joint is constructed the same as a doweled mortise and tenon joint except that the tenon projects far enough through the mortise to admit the insertion of a tapering key which draws the mortised piece firmly against the shoulder of the tenon.”
“One soon learned, however, that it was no easy thing to make wood do exactly as one required it. It looked quite easy in the masterly hands of the experienced pattern-maker, but the mysteries of dowelling and mortice and tenon were not uncovered in a week or two.”

Etymology: From Middle English tenoun, tenown, tenon, from Anglo-Norman tenoun, from Old French tenon.

To make into a tenon.
“First we'll tenon this part, then we'll make a mortise that will fit it on that part.”
To fit with tenons.