the moon at any time after the full moon and before the new moon, so called because its illuminated area is decreasing.: Compare waxing moon.
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- Also called old moon.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use waning moon in a sentence
A waning moon had risen, and in its faint light the water of the brook glimmered coldly as it wimpled over the stony ford.A Fortune Hunter; Or, The Old Stone Corral | John Dunloe Carteret
Then, without a slip, the monoplane was off in the light of the waning moon.On the Edge of the Arctic | Harry Lincoln Sayler
Another half-hour and the waning moon rose, throwing a beam of light into their chamber; also they heard horse's hoofs again.Fair Margaret | H. Rider Haggard
Dawn came slow, silent, and majestic into the cloudless sky, where a thin sickle of waning moon hung.In the Ranks of the C.I.V. | Erskine Childers
The air was tingling with windless cold, and ghostly white with the light of a crooked, waning moon.Kings in Exile | Sir Charles George Douglas Roberts