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Jyutping wai1 zi2
Pinyin wǎi zi

Definitions (Wiktionary)
  1. noun, dialectal
    place where a mountain or body of water curves (often used in place names)

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Jyutping waai2 zi2
Pinyin wǎi zi

Definitions (CC-CEDICT)
  1. bend (in a river, road etc) (used in place names)