Definition of "bird's-mouth" []

• An interior angle or notch cut across a piece of timber, for the reception of the edge of another, as that in a rafter to be laid on a plate; -- commonly called crow's-foot in the United States. (noun)

Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)

• "If the logs are squared, cut a small bird's-mouth notch in the rafter where it extends over the side-plate logs of the pen and bevel the top end of your gable rafters to fit against the ridge-pole as in the diagrams."