We found one dictionary that defines the word antiragweed:

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1. antiragweed: Wiktionary

Definitions from Wiktionary (antiragweed) ▸ adjective:  Opposing or countering ragweeds. ▸ Words similar to antiragweed ▸ Usage examples for antiragweed ▸ Idioms related to antiragweed ▸ Wikipedia articles (New!) ▸ Popular nouns described by antiragweed ▸ Words that often appear near antiragweed ▸ Rhymes of antiragweed ▸ Invented words related to antiragweed