We found one dictionary that defines the word adder flies:

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1. adder flies: Wiktionary

▸ Words similar to adder flies ▸ Usage examples for adder flies ▸ Idioms related to adder flies ▸ Wikipedia articles (New!) ▸ Words that often appear near adder flies ▸ Rhymes of adder flies ▸ Invented words related to adder flies