腐食・腐蝕|ふしょくfushoku[0]heiban (flat)

Common
Which spelling to use
腐食腐食(ふしょく) is the more common written form and the recommended default for beginners using this word.
腐蝕腐蝕(ふしょく) is a less common written form. It is not the first choice for learners writing this word.
Definitions
  1. noun, suru verb, transitive verb, intransitive verbrot; decay; erosion
    その神社じんじゃの腐食ふしょくの原因げんいんの一ひとつは酸性雨さんせいうである。↗
    The decay of the shrine is due, in part, to acid rain.
  2. noun, suru verb, transitive verb, intransitive verbcorrosion; etching; rust
    ほら、錆さびで金属きんぞくがどんどん腐食ふしょくしているよ。↗
    Hey, rust is eating away the metal.
  3. noun, biologysaprophagy
Conjugation
Dictionary form腐食する(ふしょくする)
Polite (masu)腐食します(ふしょくします)
Negative (nai)腐食しない(ふしょくしない)
polite (masen)腐食しません(ふしょくしません)
classical zu / nu腐食せず・腐食せぬ(ふしょくせず・ふしょくせぬ)
Past (ta)腐食した(ふしょくした)
polite (mashita)腐食しました(ふしょくしました)
Past negative (nakatta)腐食しなかった(ふしょくしなかった)
polite (masen deshita)腐食しませんでした(ふしょくしませんでした)
Te form腐食して(ふしょくして)
Potential腐食できる(ふしょくできる)
Passive腐食される(ふしょくされる)
Causative腐食させる(ふしょくさせる)
Causative passive腐食させられる(ふしょくさせられる)
Conditional (ba)腐食すれば(ふしょくすれば)
tara腐食したら(ふしょくしたら)
Volitional腐食しよう(ふしょくしよう)
polite (mashou)腐食しましょう(ふしょくしましょう)
Imperative腐食しろ(ふしょくしろ)

Common forms generated by rule; see the senses for honorific or irregular usage.

Synonyms & antonyms
  • Synonym腐敗ふはいNeutralOrganic matter rotting or going bad; also figurative political corruption. Stresses spoilage and stench, while 「腐食」 stresses metal being rusted or chemically eaten away.
  • Synonym腐りくさりNeutralRotting or going bad; a native Japanese noun that is rarely used on its own, unlike the Sino-Japanese 「腐食」.
  • Synonym腐朽ふきゅうNeutralDecay of wood or metal; stresses rotting away with age, so it suits long-term deterioration rather than chemical corrosion.
  • Synonym腐れくされCasualColloquial word for rotting; also a derogatory prefix in insults like 「腐れ野郎」, a use 「腐食」 never has.
  • Related腐乱ふらんNeutralRotting and festering of corpses and the like; stresses how far decomposition has gone, a nuance 「腐食」 lacks.
  • Antonym防食ぼうしょくNeutralAntonym: preventing corrosion of metal etc.; stands directly opposite 「腐食」.

Use 「腐食」 for metals being rusted or chemically eaten away, as in 「金属の腐食」 and 「腐食防止」. For organic matter rotting choose 「腐敗」, for wood or metal decaying with age 「腐朽」, for corpses festering 「腐乱」; the antonym is 「防食」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

Japanese definitions
  1. 腐くさったり錆さびたりして形かたちが崩くずれること。
  2. 金属きんぞくの表面ひょうめんを化学かがく反応はんのうにより変化へんかさせること。
Kanji in this word
English equivalents
See also

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