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Jyutping naai5 zeoi2 zeoi2
Pinyin nǎi zuǐ zuǐ

Definitions (Wiktionary)
  1. noun, Jin
    nipple of a baby bottle
    (syn.) 奶头子, 奶嘴, 奶仔頭, 奶头, 奶頭子, 奶仔头, 奶頭, 奶喙仔, 奶喙