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Jyutping bei6 wan5 mou5
Pinyin bí yùn mǔ

Definitions (CC-CEDICT)
  1. (of Chinese pronunciation) a vowel followed by a nasal consonant
Definitions (Wiktionary)
  1. noun
    vowel followed by a nasal consonant
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)