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Webster 1913 Edition

Adj.

(Chem.)

Of, pertaining to, designating, those compounds of manganese in which the element has a lower valence as contrasted with

manganic

compounds;

as,

manganous

oxide

Manganous acid

a hypothetical compound analogous to sulphurous acid, and forming the so-called manganites.

manganous ‎(not comparable)