Binder \Bind"er\, n.

1. One who binds; as, a binder of sheaves; one whose trade is to bind; as, a binder of books.

2. Anything that binds, as a fillet, cord, rope, or band; a bandage; -- esp. the principal piece of timber intended to bind together any building.

Source: Webster's Revised Unabridged Dictionary (1913)