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- (rare) The moon tinted towards blue as it appears in the sky, caused by dust or smoke in the atmosphere.
- An extra full moon that appears in a subdivision of a year, namely:
- (idiomatic, by extension) A long time.
- A bright blue, sweet-flavored ice cream that is popular in the Midwestern U.S. and is a component of Superman ice cream.
- blue moon on Wikipedia.Wikipedia
- blue moon (ice cream) on Wikipedia.Wikipedia
- blue moon (disambiguation) on Wikipedia.Wikipedia