Lunar Phrase for Something Rare: Once in a __
This page is the CodyCross answer for the clue below from Spa Time, Group 811, Puzzle 5 (Hydrating Serum).
Question is: Lunar Phrase for Something Rare: Once in a __
and the answer is: BLUEMOON
Word Meaning:
BLUE MOON — (countable) An extra full moon that appears in a subdivision of a year, namely:
Definitions from Wiktionary.