a. [ Cf. F. manganique. ] (Chem.) Of, pertaining to resembling, or containing, manganese; specif., designating compounds in which manganese has a higher valence as contrasted with manganous compounds. Cf. Manganous. [ 1913 Webster ]

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 ]