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Jyutping naai5 tau4 zi2
Pinyin nǎi tóu zi

Definitions (Wiktionary)
  1. noun, Gan, Mandarin, Yangzhou
    nipple of a baby bottle
    (syn.) 奶嘴, 奶仔頭, 奶头, 奶仔头, 奶頭, 奶喙仔, 奶嘴嘴, 奶喙
  2. noun, Gan, Mandarin, Yangzhou
    nipple