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manganoso-manganic

mangaˌnoso-manˈganic, a. Chem. Obs.
  [ad. mod.L. manganōso-manganicus (Berzelius): cf. manganous and manganic.]
  Having a formula which is the sum of that of a ‘manganous’ and that of a ‘manganic’ compound. manganoso-manganic oxide: red oxide of manganese, Mn3O4.

1845 Parnell Chem. Anal. 331 Manganoso-manganic oxide. 1865 Watts Dict. Chem. IV. 801 Manganese occurs..as manganic and manganoso-manganic oxide.

Oxford English Dictionary

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