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Jyutping mi1 sin1
Pinyin mī xiān

Definitions (Wiktionary)
  1. noun, Cantonese, Hong-Kong
    streptomycin
    (syn.) 链霉素, 鏈黴素

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Jyutping mai1 sin1
Pinyin mī xiān

Definitions (CC-CANTO)
  1. streptomycin, an antibiotic drug