We found one dictionary that defines the word gallapple:

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1. gallapple: Wiktionary

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