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polyacid

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WordReference Random House Unabridged Dictionary of American English © 2026

pol•y•ac•id [Chem.]
adj.

Chemistryhaving more than one replaceable hydrogen atom.
Chemistrycapable of reacting with more than one equivalent weight of an acid.

n.

Chemistryan acid having more than one replaceable hydrogen atom.
Chemistryan oxyacid containing the equivalent of extra molecules of its anhydride, as the polysulfuric acids, H₂S₂O₇ or H₂SO₄·SO₃, and H₂S₃O₁₀ or H₂SO₄·2SO₃.

poly- + acid 1855–60

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