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comparative more polyprotic, superlative most polyprotic
(chemistry, of an acid or a base) That can donate (or accept) more than one proton; polybasic. quotations examples
Many acids, however, are able to furnish more than one proton per molecule; these are known as polyprotic acids.
1946, Alexander Smith, Smith's College Chemistry, page 267
Some important acids, such as sulfuric acid (H2SO4) and phosphoric acid (H3PO4) can furnish more than one proton and are called polyprotic acids.
2011, Steven S. Zumdahl, Chemistry: An Atoms First Approach
Carbonic acid from CO2 and amino acids from proteins are examples of polyprotic acids—those having more than one acidic proton.
2012, Daniel C. Harris, Exploring Chemical Analysis, page 233