| Part of Speech | Definition | |
| Noun | 1. 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.[Websters]. | |
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Date "BIRD'S-MOUTH" was first used in popular English literature: sometime before 1914. (references) |
