kryptonite

Pronunciation

• IPA ^(key): /ˈkrɪptənaɪt/

• Audio (UK)

  (file)

Noun

Singular kryptonite

Plural none

1. (science-fiction) Kryptonite is a fictional crystal in comics. It is Superman's only weakness.
2. (figurative) A person's kryptonite is their only weakness, or their biggest weakness.