01 a. Of, pertaining to, designating, those compounds of manganese in which the element has a lower valence as contrasted with manganic compounds…
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1.
Of, pertaining to, designating, those compounds of manganese in which the element has a lower valence as contrasted with manganic compounds; as, manganous oxide.(Chem.)
Phrases & compounds
Manganous acid —
a hypothetical compound analogous to sulphurous acid, and forming the so-called manganites.