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Substances whose aqueous solutions are characterized by a sour taste, the ability to turn blue litmus red, and the ability to react with bases and certain metals to form salts; yields hydrogen ions when dissolved in water, acts as a proton donor, and can accept a pair of electrons to form a covalent bond.

Definition from: Unified Medical Language SystemThis link leads to a site outside Genetics Home Reference. (CRISP Thesaurus)   at the National Library of Medicine

Related discussion in the Handbook

Published: January 23, 2009