anhydrous
/anˈhʌɪdrəs
/adjective Chemistry
(Of a substance, especially a crystalline compound) containing no water.The sample was maintained at room temperature for 24 h to ensure conversion of any anhydrous cholesterol crystals to the monohydrate form....
- The plants produced urea ammonium nitrate and anhydrous ammonia.
- The water in the mantle may be contained either in high pressure hydrous phases, or alternatively as small hydrous defects in nominally anhydrous minerals.
Origin
Early 19th century: from Greek anudros (from an- 'without' + hudōr 'water') + -ous.
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