Use 'gibbous' to describe the moon or planets when discussing astronomy. It signals specific lunar phases. Astronomers say the gibbous moon signifies a phase that is ¾ complete.
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Poetic Imagery
Writers use 'gibbous' to evoke vivid imagery or describe the moon in creative writing. The poet wrote about a silver gibbous moon hanging low in the night sky.
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Waxing and Waning
'Gibbous' often combines with 'waning' or 'waxing' to show whether the moon is shrinking or growing. The waxing gibbous phase comes before a full moon.