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The Collaborative International Dictionary
Hydrocarbonate

Hydrocarbonate \Hy`dro*car"bon*ate\, n.

  1. (Old Chem.) A hydrocarbon. [Obs.]

  2. (Chem.) A hydrous carbonate, as malachite.

Wiktionary
hydrocarbonate

n. 1 (context chemistry obsolete English) A hydrocarbon. 2 (context chemistry obsolete English) A hydrous carbonate, such as malachite.