coupler

[kuhp-ler] /ˈkʌp lər/
noun
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.
Origin
1545-55; couple + -er1
Examples from the web for coupler
  • The coupler fractures upon impact at a predetermined scored line in the coupling, releasing the sign post from the ground stub.
  • Duct tape around hose coupler on sewer line is deteriorating.
  • Tape is used possible to secure the coupler to sewer line.
British Dictionary definitions for coupler

coupler

/ˈkʌplə/
noun
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 & Canadian) a device for connecting railway cars or trucks together Also called (in eg Britain) coupling