We found one dictionary that defines the word numberwing:

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1. numberwing: Wiktionary

Definitions from Wiktionary (numberwing) ▸ noun:  An eighty-eight butterfly. ▸ Words similar to numberwing ▸ Usage examples for numberwing ▸ Idioms related to numberwing ▸ Wikipedia articles (New!) ▸ Popular adjectives describing numberwing ▸ Words that often appear near numberwing ▸ Rhymes of numberwing ▸ Invented words related to numberwing