We found one dictionary that defines the word ribbonworms:

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1. ribbonworms: Wiktionary

Opposite: flatworms, roundworms, segmented worms ▸ Words similar to ribbonworms ▸ Usage examples for ribbonworms ▸ Idioms related to ribbonworms ▸ Wikipedia articles (New!) ▸ Words that often appear near ribbonworms ▸ Rhymes of ribbonworms ▸ Invented words related to ribbonworms