We found one dictionary that defines the word rain moon:

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1. rain moon: Wiktionary

Definitions from Wiktionary (rain moon) ▸ noun:  A full moon in April. ▸ Words similar to rain moon ▸ Usage examples for rain moon ▸ Idioms related to rain moon ▸ Wikipedia articles (New!) ▸ Words that often appear near rain moon ▸ Rhymes of rain moon ▸ Invented words related to rain moon