Rabbet
Definition of rabbet:
part of speech: noun
A groove cut in the edge of a plank so that another may fit into it.
part of speech: verb
To channel out, as the edge of a board.
part of speech: verb
part of speech: verb
To join, as parts cut or grooved to fit together.
part of speech: noun
A groove or cut, made in the edge of one plank, etc., so that another may fit into it.