D defs.my
Entry 3 senses Webster, 1913

Binder

/bīn'-dẽr/ · Bind·er · IPA /ˈbaɪndɚ/
01 n. One who binds; as, a binder of sheaves; one whose trade is to bind; as, a binder of books.
  1. 1.
    One who binds; as, a binder of sheaves; one whose trade is to bind; as, a binder of books.
  2. 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.
  3. 3.
    a pair of stiff oblong covers, sometimes detachable, designed for insertion of paper pages to create a book-like document, such as in a loose-leaf binder.