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Jyutping mei5 gwok3 sin1 daan1
Pinyin měi guó xiān dān

Definitions (Wiktionary)
  1. noun, Taiwanese-Hokkien
    miracle cure; wonder pill; panacea
    (syn.) 灵丹妙药, 靈丹妙藥
  2. noun, Taiwanese-Hokkien
    steroid
    (syn.) 類固醇, 类固醇