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Jyutping niu5 goek3 aa3 muk6
Pinyin niǎo jiǎo yà mù

Definitions (CC-CEDICT)
  1. Ornithopoda (suborder of herbivorous dinosaurs)
Definitions (Wiktionary)
  1. noun
    Ornithopoda
    (syn.) 鳥腳下目