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沸
Secondary-school Jōyō Kanji

沸 — “Seethe / Boil / Ferment / Uproar” in Japanese

Master (高手)ふつ, わ
Radical ⽔ · radical 85 The building block this kanji is filed under

“Seethe / Boil / Ferment / Uproar” in Japanese is 沸, read futsu, wa (ふつ, わ). It is a Jōyō kanji taught in Japanese secondary school (junior & senior high) — the 高手 · Master tier beyond the grade 1–6 Kyōiku set, and appears in words such as 沸騰 (boiling).

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What does 沸 mean?

Full details, readings & example
Kanji沸
MeaningSeethe / Boil / Ferment / Uproar
Readingsふつ, わ
GradeMaster (高手 · secondary school)
CurriculumJōyō kanji · Japanese secondary school (JLPT N1–N2)
Example沸騰 (boiling)

How to read 沸

沸 is read futsu (ふつ) or wa (わ) depending on the word.

Words with 沸

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Kanji read the same way as 沸

Same sound, different character — the classic trap. Compare them side by side:

Updated: 2026-08-28
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