Definition of electrotelegraphy in US English:

electrotelegraphy

noun

Telegraphy
rare, historical
  • Telegraphy employing the electric telegraph or (more generally) electric signals.

Origin

Mid 19th century; earliest use found in The Mechanics' Magazine.

Pronunciation

electrotelegraphy

/ɪˌlɛktrə(ʊ)tɪˈlɛɡrəfi/