A rectangular piece fitting grooves like key seats in a hub and a shaft, so that while the one may slide endwise on the other, both must revolve together; a feather; also, sometimes, a groove to receive such a rectangular piece.
- Any of a series of projections on a shaft that fit into slots on a corresponding shaft, enabling both to rotate together.
- The groove or slot for such a projection.
- A flexible piece of wood, hard rubber, or metal used in drawing curves.
- A wooden or metal strip; a slat.