無煙火藥 [无烟－药]

Jyutping mou4 jin1 fo2 joek6
Pinyin wú yān huǒ yào

Definitions (Wiktionary)
  1. noun
    smokeless powder; ballistite
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）