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  1. HOUGHTON MIFFLIN

    blue moon

    • n.
      The third full moon in a three-month calendrical season that has four full moons.；The second of two full moons occurring in the same month.
    • 釋義
    • 相關詞

    名詞

    • 1. The third full moon in a three-month calendrical season that has four full moons.
    • 2. The second of two full moons occurring in the same month.
    • 3. A relatively long period of time. I haven't seen you in a blue moon.

    once in a blue moon

    • ph.
      very rarely

    Oxford American Dictionary

    once in a blue moon

    • ph.
      very rarely

    Oxford Dictionary

    • 更多解釋

    blue moon

    • n.
      a phenomenon whereby the moon appears bluish owing to smoke or dust particles in the atmosphere: people saw blue moons for years after the 1883 eruption of Krakatoa

    Oxford American Dictionary

    blue moon

    • n.
      a phenomenon whereby the moon appears bluish owing to smoke or dust particles in the atmosphere: people saw blue moons for years after the 1883 eruption of Krakatoa

    Oxford Dictionary