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Jyutping tin1 man4 toi4
Pinyin tiān wén tái

Definitions (Wiktionary)
  1. noun
    observatory (place where celestial bodies are observed)
  2. noun, Cantonese, Hong-Kong, colloquial
    lookout; lookout man
  3. noun, Hong-Kong
    meteorological observatory
Examples (Wiktionary)
  1. Mandarin
    天文台
    天文臺
    tiān wén tái
    • observatory (place where celestial bodies are observed)