Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. One that couples, especially a device for coupling two railroad cars.
  • n. A device connecting two organ keyboards so that they may be played together.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Someone who couples things together, especially someone whose job it is to couple railway carriages.
  • n. Anything that serves to couple things together; but especially a device that couples railway carriages.
  • n. A device that connects two keyboards of an organ together so that they play together.
  • n. A device used to convert electronic information into audible sound signals for transmission over telephone lines.
  • n. An electrical device used to transfer energy from one electric device to another, especially without a physical connection.

from the GNU version of the Collaborative International Dictionary of English

  • n. One who couples; that which couples, as a link, ring, or shackle, to connect cars.

from The Century Dictionary and Cyclopedia

  • n. One who or that which couples, joins, or unites.
  • n. In zoology, a plate which joins one of the swimming-appendages of a crustacean to its fellow on the opposite side of the body.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a mechanical device that serves to connect the ends of adjacent objects

Etymologies

From couple +‎ -er. (Wiktionary)

Examples

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