feath·er·board 
(fĕthər-bôrd′)
(fĕthər-bôrd′)n.
A flat, usually narrow piece of wood or plastic having a series of close cuts made at an angle along a comblike edge, used to hold a piece of wood against a fence as the wood is pushed along a table saw or router.
[From the feathers (strips of wood or plastic) making up the comblike edge.]
featherboard