Etymology

kayakujutsu

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Today it means: In Japanese martial arts, the use of firearms, gunpowder and explosives, especially by ninja. Full definition →

Japanese 火薬術
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The story

  1. Japanese · borrowed from火薬術
  2. English todaykayakujutsu

From Japanese 火薬術 (literally “art of gunpowder”).

Etymology from Wiktionary, CC BY-SA 4.0.