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Jyutping bei6 wan1 saan3
Pinyin bì wēn sǎn

Definitions (Wiktionary)
  1. noun
    A vermilion powder to be inhaled, as used in traditional Chinese medicine to "expel summer heat and evil factors, to promote resuscitation, to alleviate pain when indicated by symptoms of dizziness, headache, stuffed nose, nausea and vomiting caused by summer heat, carsickness, or seasickness.".