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Jyutping dau3 ngau4
Pinyin dǒu niú

Definitions (Wiktionary)
  1. noun, archaic
    [the area of the sky between] the Dipper and the Ox [constellations]

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Jyutping dau2 ngau4
Pinyin dǒu niú

Definitions (CC-CEDICT)
  1. Big Dipper and Altair (astronomy)