As adjectives the difference between anhydrous and hydrated
is that anhydrous
is having little or no water while hydrated
is (chemistry) combined chemically with water.
As a verb hydrated is
Other Comparisons: What's the difference?
having little or no water
# (chemistry) having no water of crystallization
- We took the powdered milk and hydrated it until it was drinkable.
(chemistry) Combined chemically with water.