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Meaning of sesquicarbonate

ses•qui•car•bon•ate

Pronunciation: (ses"kwi-kär'bu-nāt", -nit), [key]
— n. Chem.
  1. a salt intermediate in composition between a carbonate and a bicarbonate or consisting of the two combined.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.