Definition: Prefix used in the names of those chemical compounds that differ from other and more familiar compounds in the absence of two hydrogen atoms; dehydroascorbic acid, which resembles ascorbic acid in all structural features except for its lack of two hydrogen atoms that are present in the ascorbic acid molecule. In systematic nomenclature, didehydro- is preferred as being more exact.
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Examples: glitazone, GI cocktail, etc.