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The word polyanionic describes a physical property of a chemical or molecule. It means the substance contains more than one negative charge.

Polyanionic is a combination of the words 'anion' and 'poly.'

The prefix 'poly' is a "word-forming element meaning "many, much, multi-, one or more," from Greek polys "much" (plural polloi)" Taken from: "https://www.etymonline.com/word/poly-"

Anions are substances or molecules that have a net negative charge in a particular environment, which usually depends on the pH of said environment.