What does Bird's-mouth mean?

Bird's-mouth meaning in General Dictionary

an inside position or notch cut across an item of timber, the reception of edge of another, as that in a rafter is set on a plate; -- generally known as crow's-foot inside United Says.


Bird's-mouth meaning in General Dictionary

(letter.) An inside perspective or notch slice across a bit of wood, for the reception of edge of another, as that in a rafter is laid on a plate; -- frequently called crow's foot in america.