anhydrous

[In Ger. anhyder. From Gr. ἄνυδρος ( anudros ) = without water; ἀν (an), priv., and ὕδωρ ( hudor ) = water.] 1. Chemistry: Having no water in its composition; as anhydrous gypsum, gypsum with no water in its composition. thus the anhydrous sulphuric acid does not redden litmus."-Graham: Chemistry , vol. ii., p. 188, 2. Mineralogy. Dana divides the minerals cla ed as compounds of Chlorine, Bromine, and Iodine into (1) Anhydrous Chlorids, (2) Hydrous Chlorids, and (3) Oxy chlorids. ( Dana : Min., 5th ed., p. 110.) He separates Fluorine Compounds into Anhydrous and Hydrous ( Ibid ., p. 123), and adopts the same cla ification of the Oxyds: 1st. ( Ibid ., 131); the Silicates ( Ibid ., 203); the Phosphates, Arsenates, Antimonates ( Ibid . , 527); the Sulphates, Chromates, Tellurates ( Ibid ., 613), and the Carbonates ( Ibid ., 669). *ăn-1, a. [ANY.]