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bismuthic
bismuthic adj. 
/bɪzˈmjuːθɪk/ of bismuth, applied to compounds in which bismuth combines as a pentad, as bismuthic oxide, Bi2 O5.
/bɪzˈmjuːθɪk/ of bismuth, applied to compounds in which bismuth combines as a pentad, as bismuthic oxide, Bi2 O5.ΘΚΠ
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bismuthic1799
bismuthous1881
1799 R. Kirwan Geol. Ess. 428 Bismuthic, cobaltic, arsenical pyrites.
1854 J. Scoffern in Orr's Circle Sci. Chem. 469 The peroxide of bismuth, or bismuthic acid.
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