We found one dictionary that defines the word polyanions:

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1. polyanions: Wiktionary

Opposite: poly cations, anions ▸ Words similar to polyanions ▸ Usage examples for polyanions ▸ Idioms related to polyanions ▸ Wikipedia articles (New!) ▸ Words that often appear near polyanions ▸ Rhymes of polyanions ▸ Invented words related to polyanions