Dictionary.com
definitions
  • synonyms

waning moon

See more synonyms on Thesaurus.com
noun
  1. the moon at any time after full moon and before new moon (so called because its illuminated area is decreasing).
Show More
Compare waxing moon.

Origin of waning moon

before 1000; Middle English; Old English
Also called old moon.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018