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Define the word H2MnO4

"H2MnO4" gcide "The Collaborative International Dictionary of English v.0.48"

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.
   [1913 Webster + WordNet 1.5]