American Dictionary

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Definition gibbous in American English

gibbous adjective

adjective
1

a gibbous moon's observable side is illuminated over more than half its area

Example

I know not why my dreams were so wild that night; but ere the waning and fantastically gibbous moon had risen far above the eastern plain, I was awake in a cold perspiration, determined to sleep no more.

Definition gibbous in American English