Cog(n.)
- A tooth, cam, or catch for imparting or receiving motion, as on a gear wheel, or a lifter or wiper on a shaft; originally, a separate piece of wood set in a mortise in the face of a wheel.
Cog(n.)
- A kind of tenon on the end of a joist, received into a notch in a bearing timber, and resting flush with its upper surface.