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cobalto-

coˈbalto- Chem.
  Combining form of cobalt used in the names of di-compounds, as in cobalto-cyanide of potassium, etc.

1842 E. Turner Elem. Chem. (ed. 7) 741 The cobalto-cyanide of lead..Cobalto-cyanide of Potassium.

Oxford English Dictionary

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