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硬化

こうかkouka

noun · suru verb · intransitive

  1. hardening
  2. vulcanization
  3. vulcanisation
  4. sclerosis
  5. curing
  6. hardening (of attitude, stance, etc.)
  7. stiffening
  8. toughening

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Data from JMdict, KANJIDIC2 (EDRDG), KanjiVG, CC-CEDICT and Make Me a Hanzi. Sources and licences