Meaning of the word coupler in English

What does coupler mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

coupler

US /ˈkʌplər/
UK /ˈkʌplər/

Noun

a device for connecting two things, especially two railway cars or two parts of a machine

Example:
The train cars were joined by a strong coupler.
He installed a new optical coupler in the circuit.