Etymology
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carbohydrate (n.)

general name for a group of organic compounds consisting of carbon atoms in multiples of 6 and hydrogen and oxygen in the proportion of water, 1851, from carbo-, combining form of carbon, + hydrate (n.), denoting compound produced when certain substances combine with water, from Greek hydor "water" (from suffixed form of PIE root *wed- (1) "water; wet").

The name carbohydrate was given to these compounds because, in composition, they are apparently hydrates of carbon. In structure, however, they are far more complex. [Flood]

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Definitions of carbohydrate

carbohydrate (n.)
an essential structural component of living cells and source of energy for animals; includes simple sugars with small molecules as well as macromolecular substances; are classified according to the number of monosaccharide groups they contain;
Synonyms: saccharide / sugar
From wordnet.princeton.edu