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Jyutping sai3 san1
Pinyin xì xīn

Definitions (CC-CEDICT)
  1. Manchurian wild ginger (family Asarum)
Definitions (Wiktionary)
  1. noun
    Asarum sieboldii or wild ginger. (An herb used in traditional Chinese medicine externally to treat mouth ulcers, and internally as an anti-biotic, anaesthetic, anti-histamine, and to treat deafness.)