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Jyutping gu3 saan1 bui3 zi2
Pinyin gù shān bèi zǐ

Definitions (Wiktionary)
  1. noun, historical
    Prince of the Fourth Rank; the fourth rank of male members of imperial clan in Qing dynasty below that of Duoluo beile (多羅貝勒)
    (syn.) 贝子, 貝子