coupler

The definition of a coupler is a device used to connect two things.

(noun)

An example of a coupler is the metal device that connects one train car to another.

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See coupler in Webster's New World College Dictionary

noun

a person or thing that couples; specif.,
  1. a device for coupling two railroad cars
  2. a device on an organ connecting two keyboards or keys an octave apart so that they can be played together

See coupler in American Heritage Dictionary 4

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

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