blue moon

noun

The third full moon in a season that contains four rather than the usual three full moons.

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Meanings

nounblue moon (countable and uncountable, plural blue moons)

plural blue moons

  1. An extra full moon that appears in a subdivision of a year, namely:
    1. countableuncountableThe third full moon in a season that contains four rather than the usual three full moons.
    2. countableuncountableThe second of two full moons that occur in the same calendar month (a definition created by mistake in the 20th century).
  2. countablerareThe moon tinted towards blue as it appears in the sky, caused by dust or smoke in the atmosphere.
  3. broadlycountableidiomaticA long time.
  4. uncountableA bright blue, sweet-flavored ice cream that is popular in the Midwestern U.S. and is a component of Superman ice cream.

Synonyms & antonyms

Also see
ageeldeonminutemonth of sundayswhile

Translations

Basque ilargi urdin
  • ilargi urdinfull moon
Catalan lluna blava
  • lluna blavafull moon
Czech šmoulová zmrzlina
  • šmoulová zmrzlinaice cream
French lune bleue
  • lune bleuefull moon
German Schlumpfeis
  • Schlumpfeisice cream
Italian luna blu
  • luna blufull moon
Japanese ブルームーン, ブルームーン
  • ブルームーン (burū mūn)ice cream
  • ブルームーン (burū mūn)full moon
Korean 블루문, 블루문
  • 블루문 (beullumun)ice cream
  • 블루문 (beullumun)full moon
Portuguese lua azul
  • lua azulfull moon
Russian голуба́я луна́
  • голуба́я луна́ (golubája luná)full moon
Spanish luna azul
  • luna azulfull moon
Vietnamese trăng xanh, trăng xanh
  • trăng xanhice cream
  • trăng xanhfull moon

Rhymes & wordplay

Rhymes with blue moon

junesoonmooncartoonafternoontunenoontribuneimmuneballoonCameroonspoonsaloonlagoontoontycoondunenuntyphoonboonmonsoonplatooncocoonrune
All rhymes →
Cite this entry
APA

blue moon. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/blue%20moon

MLA

“blue moon.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/blue%20moon. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “blue moon,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/blue%20moon.

Source: blue moon on Wiktionary, CC BY-SA 4.0.