Carbohydrate \Car`bo*hy"drate\, n. [Carbon + hydrate.]

(Physiol. Chem.) One of a group of compounds including the sugars, starches, and gums, which contain six (or some multiple of six) carbon atoms, united with a variable number of hydrogen and oxygen atoms, but with the two latter always in proportion as to form water; as dextrose, C6H12O6.

Source: Webster's Revised Unabridged Dictionary (1913)