Phrase guide

cold fusion

noun · 4 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

Nuclear fusion at or near room temperature.

A hypothetical and now discredited form of nuclear fusion involving electrolysis of heavy water.

Definition source: English Wiktionary via Wiktextract

Usage: uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

Nuclear fusion at or near room temperature.

Muon-catalyzed fusion

Definition source: English Wiktionary via Wiktextract

Usage: dated, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

A method of synthesizing superheavy elements, where the product nucleus has a relatively low excitation energy of ~10 to 20 MeV.

Definition source: English Wiktionary via Wiktextract

Usage: uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

nuclear fusion at or near room temperatures; claims to have discovered it are generally considered to have been mistaken

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: fusion, nuclear fusion, nuclear fusion reaction

History

Etymology

No etymology was provided for this word.

Across languages

Translations

29 source translations are retained for this English entry.

  • Arabic: اِنْدِمَاج بَارِد (indimāj bārid) — nuclear fusion near room temperature
  • Belarusian: хало́дны я́дзерны сі́нтэз (xalódny jádzjerny síntez) — nuclear fusion near room temperature
  • Bulgarian: студ́ен термоя́дрен си́нтез (stud́en termojádren síntez) — nuclear fusion near room temperature
  • Catalan: fusió freda — nuclear fusion near room temperature
  • Chinese Mandarin: 冷核聚變 /冷核聚变 (lěng hé jùbiàn) — nuclear fusion near room temperature
  • Chinese Mandarin: 冷聚變 /冷聚变 (lěng jùbiàn) — nuclear fusion near room temperature
  • Chinese Mandarin: 冷融合 (lěng rónghé) — nuclear fusion near room temperature
  • Czech: studená fúze — nuclear fusion near room temperature
  • Danish: kold fusion — nuclear fusion near room temperature
  • Dutch: koude kernfusie — nuclear fusion near room temperature
  • Finnish: kylmäfuusio — nuclear fusion near room temperature
  • French: fusion froide — nuclear fusion near room temperature
  • German: kalte Fusion — nuclear fusion near room temperature
  • Hebrew: היתוך קר — nuclear fusion near room temperature
  • Italian: fusione fredda — nuclear fusion near room temperature
  • Japanese: 常温核融合 (jōon-kakuyūgō) — nuclear fusion near room temperature
  • Macedonian: студена фузија (studena fuzija) — nuclear fusion near room temperature
  • Polish: zimna fuzja — nuclear fusion near room temperature
  • Portuguese: fusão a frio — nuclear fusion near room temperature
  • Russian: холо́дный термоя́дерный си́нтез (xolódnyj termojádernyj síntɛz) — nuclear fusion near room temperature
  • Russian: холо́дный си́нтез (xolódnyj síntɛz) — nuclear fusion near room temperature
  • Serbo-Croatian: хладна фузија — nuclear fusion near room temperature
  • Serbo-Croatian: hladna fuzija — nuclear fusion near room temperature
  • Slovak: studená fúzia — nuclear fusion near room temperature
  • Slovene: hladna fuzija — nuclear fusion near room temperature
  • Spanish: fusión fría — nuclear fusion near room temperature
  • Swedish: kall fusion — nuclear fusion near room temperature
  • Ukrainian: холо́дний си́нтез (xolódnyj sýntez) — nuclear fusion near room temperature
  • Ukrainian: холо́дний я́дерний си́нтез (xolódnyj jádernyj sýntez) — nuclear fusion near room temperature