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Jyutping mei5 fan2
Pinyin měi fěn

Definitions (Wiktionary)
  1. noun
    magnesium carbonate powder
  2. noun
    magnesium powder

鎂粉 [镁-]

Jyutping
Pinyin měi fěn

Definitions (CC-CEDICT)
  1. magnesium powder (used in pyrotechnics etc)
  2. (sports) gym chalk (magnesium carbonate), used as a drying agent on the hands of gymnasts, weight lifters etc