牽牛子 [牵－－]

Jyutping hin1 ngau4 zi2
Pinyin qiān niú zǐ

Definitions (Wiktionary)
  1. noun, Mandarin, Xining
    morning glory
  2. noun, Chinese, traditional
    seed of the morning glory (Ipomoea, syn. Pharbitis) (a herb used to treat asthma, phlegm, cough, flatulence and constipation)