Definition of keysender in US English:

keysender

noun

historical
  • 1Telegraphy. A machine for generating a Morse signal with a single keystroke. rare.

  • 2Telephony. Especially at a telephone exchange: a mechanical device for establishing connection with a particular telephone by pressing a succession of numbered keys (instead of using a dial).

Origin

Early 20th century. From key + sender.

Pronunciation

keysender

/ˈkiːsɛndə/