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Jyutping gwai2 jyut6
Pinyin guǐ yuè

Definitions (粵典–words.hk)
  1. 名詞
    農​曆​七月​嘅​別​稱​,​因為​傳​説​呢​個​月​鬼​門​開
    a nickname for the seventh month in the traditional agricultural calendar, literally ghost month
Definitions (Wiktionary)
  1. noun
    Ghost Month (the seventh lunar month)