NOUN
- key consisting of a lever that sends a telegraph signal when it is depressed and the circuit is closed
How To Use telegraph key In A Sentence
- The bear proceeded rather deliberately to nose the hotel's telegraph key before walking out the front door into the night.
- Experienced naval intercept operators could sometimes recognize individual Japanese radio operators by their unique use of the radiotelegraph key to send the dots and dashes of their code. DAY OF DECEIT
- A woman sits at a telegraph key and rattles Morse code along a wire.