binder

Etymology

From Middle English byndere; equivalent to bind + -er.

noun

1. Someone who binds.
   1. Someone who binds books; a bookbinder.
2. A cover or holder for unbound papers, pages, etc.
3. Something that is used to bind things together, often referring to the mechanism that accomplishes this for a book.
4. (programming) A software mechanism that performs binding.
   The runtime binder considers inheritance and name hiding, and does overload resolution. 2004, Paul Vick, The Visual Basic .NET Programming Language, page 389
5. (computing) A program or routine that attaches malware to an existing harmless file on the target system.
   Some of these file binders can produce files that can't be detected by some anti-viruses, and if downloaded and run by an unsuspecting user, it can result in a system compromise. 2013, John R. Vacca, Managing Information Security, page 291
6. A dossier.
7. (agriculture) A machine used in harvesting that ties cut stalks of grain into a bundle.
8. (chemistry) A chemical or other substance that causes two other substances to form into one.
9. (law) A down payment on a piece of real property that secures the payor the right to purchase the property from the payee upon an agreement of terms.
10. (chiefly Minnesota) A rubber band.
11. (LGBT) Material or clothing used in binding or flattening the breasts.
    He had to send back the binders and return to clothing that was at least gender-neutral. 2014, Sigrid Rausing, Granta 129: Fate
12. (molecular biology) A protein binder.