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Jyutping wan5 baak6
Pinyin yùn bái

Definitions (CC-CEDICT)
  1. form of rhymed baihua 白話|白话[bai2 hua4] in Beijing opera
Definitions (Wiktionary)
  1. noun
    A spectrum of traditional variants of Mandarin whose pronunciation is regulated by rhyme books, especially those that are preserved in various regional and trans-regional Chinese operas, such as Kun opera and Beijing opera, as opposed to the local dialects of those regions.
  2. noun
    rhyming spoken parts in traditional opera