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The Collaborative International Dictionary
manganic acid

manganic acid \manganic acid\ n. A dibasic acid H2MnO4, formed from manganese, analogous to sulphuric acid; it is found only in solution and in manganate salts.

Wiktionary
manganic acid

n. (context chemistry English) An acid, H2MnO4, formed from manganese, analogous to sulfuric acid.

WordNet
manganic acid

n. a dibasic acid (H2MnO4) found only in solution and in manganate salts