We found one dictionary that defines the word rainberry:

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1. rainberry: Wiktionary

Definitions from Wiktionary (rainberry) ▸ noun:  Synonym of riberry ▸ Words similar to rainberry ▸ Usage examples for rainberry ▸ Idioms related to rainberry ▸ Wikipedia articles (New!) ▸ Popular adjectives describing rainberry ▸ Words that often appear near rainberry ▸ Rhymes of rainberry ▸ Invented words related to rainberry