Definition of spambot in US English:

spambot

noun

Computing
  • An autonomous program on the Internet that sends spam to a large number of users or posts spam on online forums.

    ‘you really don't want spambots to see your email address’
    as modifier ‘a noticeable reduction in spambot activity’

Origin

1990s: from spam + bot.

Pronunciation

spambot

/ˈspæmˌbɑt//ˈspamˌbät/