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Jyutping duk6 ngaa5 si1
Pinyin dú wǎ sī

Definitions (CC-CEDICT)
  1. poisonous gas
  2. stinking fart
Definitions (Wiktionary)
  1. noun, obsolete
    poison gas
    (syn.) 毒气, 毒氣
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)