WordNet (3.0) WordNet (3.0)
(n) a dibasic acid (H2MnO4) found only in solution and in manganate salts
(n) an unstable purple acid (HMnO4) known only in solution or of permanganate salts
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
n. A dibasic acid
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