A disaccharide sugar formed from two six-carbon sugars joined together.
From 'hexo-' (six-carbon sugar) and '-biose' (two sugars). The term developed in carbohydrate chemistry to name double sugars made from hexose units.
Just as 'sucrose' is glucose plus fructose, hexobiose represents any pairing of six-carbon sugars—it's chemistry's way of describing how simple sugars link up into slightly more complex ones.
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