Phrase guide

nuclear meltdown

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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1

noun

Meaning 1

A severe nuclear reactor accident that results in core damage from overheating

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

severe overheating of the core of a nuclear reactor resulting in the core melting and radiation escaping

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: meltdown

Antonyms: none provided

Broader terms: overheating

History

Etymology

No etymology was provided for this word.

Across languages

Translations

4 source translations are retained for this English entry.

  • German: Kernschmelze — severe nuclear reactor accident
  • Spanish: fusión de núcleo — severe nuclear reactor accident
  • Spanish: fundición nuclear — severe nuclear reactor accident
  • Spanish: derretimiento nuclear — severe nuclear reactor accident