coupler(n = noun.artifact) coupling - a mechanical device that serves to connect the ends of adjacent objects;
is a kind of mechanical device
has particulars: clevis, clutch, fluid drive, swivel, turnbuckle, universal, universal joint
Derived form verb couple2
One who couples; that which couples, as a link, ring, or shackle, to connect cars. [1913 Webster]
coupler, n.
1 Mus. a a device in an organ for connecting two manuals, or a manual with pedals, so that they both sound when only one is played. b (also octave coupler) a similar device for connecting notes with their octaves above or below.
2 anything that connects two things, esp. a transformer used for connecting electric circuits.