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an·hy·drous (')an-'hī-drəs adj free from water and esp. water that is chemically combined in a crystalline substance <\anhydrous ammonia>
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an·hy·drous (an-hiґdrəs) [Gr. anydros waterless, from an-1 + hydōr water] 1. deprived of water. 2. of an inorganic compound, not containing water, either in the form of water of crystallization or as water adsorbed to the surface.Medical dictionary. 2011.