Definition of megadeath in US English:

megadeath

noun

  • A unit used in quantifying the casualties of nuclear war, equal to the deaths of one million people.

    • ‘Dr. Caldicott retreated to the outback, but she left a legacy of tremendous mass awareness about the threat of nuke megadeath and planetcide.’
    • ‘We're talking megadeaths, if not outright extinction!’

Pronunciation

megadeath

/ˈmɛɡəˌdɛθ//ˈmeɡəˌdeTH/