Definition of kaiju in English:

kaiju

Pronunciation /ˈkīˌjo͞o/ /ˈkaɪˌdʒu/

nounkaiju, kaijus

  • A giant monster of a type featured in Japanese fantasy and science fiction movies and television programs.

    ‘they're embarking on a battle against a kaiju’
    • ‘these kaiju seem focused on destroying whatever they see’
    • ‘he was a massive fan of kaiju films’

Origin

Japanese, from kai ‘mystery, apparition, specter’ + jū ‘beast’.