Etymology
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anhydrous (adj.)

"containing no water," 1809, a modern coinage from Greek an- "not, without" (see an- (1)) + hydor "water" (from PIE root *wed- (1) "water; wet") + -ous. Greek did have anhydros "waterless," used of arid lands or corpses that had not been given proper funeral rites.

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Definitions of anhydrous

anhydrous (adj.)
without water; especially without water of crystallization;
From wordnet.princeton.edu