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See more synonyms for coupler on Thesaurus.com
  1. a person or thing that couples or links together.
  2. Machinery. a rod or link transmitting force and motion between a rotating part and a rotating or oscillating part.
  3. Also called coupling. Railroads. a device for joining pieces of rolling stock.
  4. a device in an organ or harpsichord for connecting keys, manuals, or a manual and pedals, so that they are played together when one is played.
  5. Electricity. a device for transferring electrical energy from one circuit to another, as a transformer that joins parts of a radio apparatus together by induction.
  6. (in color photography) a chemical that reacts with the developer to produce one of the colors in a print or transparency.
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Origin of coupler

First recorded in 1545–55; couple + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for coupler

Historical Examples

  • He's been working on what amounts almost to the Coupler Theory for ten years.

    The Galaxy Primes

    Edward Elmer Smith

  • Note that there is no drawbar and that the coupler is merely bolted to the beams.

  • About 11:30 the boys returned with the tug and new bolts for our coupler.

    The houseboat book

    William F. Waugh

  • Why, I remember when a coupler Turks 'elped in the good work one mornin'.

  • Guess I'll haul her off a coupler points an' try the whistle again.

    Captain Scraggs

    Peter B. Kyne

British Dictionary definitions for coupler


  1. a link or rod transmitting power between two rotating mechanisms or a rotating part and a reciprocating part
  2. music a device on an organ or harpsichord connecting two keys, two manuals, etc, so that both may be played at once
  3. electronics a device, such as a transformer, used to couple two or more electrical circuits
  4. US and Canadian a device for connecting railway cars or trucks togetherAlso called (in eg Britain): coupling
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012