This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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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.

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.

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

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.

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

"Yes you can connect that to your mac with the "coupler" you've bought"

mechanical device   

automatic coupler   

clevis    fluid drive    turn-buckle    universal joint    clutch    swivel    universal   

couplers    amplifier    attenuator    sprinkler    cabling    detector    cuto¤    analyzer    joystick    connector