anhydrous (adj.) Look up anhydrous at Dictionary.com
"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.