IPA: /ˌæn.tɪˈnjuː.klər/
KK: /ˌæntɪˈnjuːklər/
Describing a stance or action that is against the use or production of nuclear power or weapons.
Many activists are antinuclear, advocating for renewable energy sources instead.
Antinuclear is formed from "anti-" (meaning against) and "nuclear" (from Latin "nucleus", meaning kernel or core). The word describes a stance or movement that is against nuclear energy or weapons.
Think of being 'against' ('anti-') the 'core' ('nucleus') of nuclear energy — that's what antinuclear means.