Definition of internaut in US English:

internaut

noun

informal
  • A user of the Internet, especially a habitual or skilled one.

    • ‘The two so-called internauts will have everything necessary for a normal life, such as food and beds.’

Origin

1990s: blend of Internet and astronaut.

Pronunciation

internaut

/ˈɪn(t)ərˌnɔt//ˈin(t)ərˌnôt/