- The definition of anhydrous is without water.
Gaseous ammonia and gaseous hydrogen chloride are examples of anhydrous substances.
- without water
- Chem. having no water of crystallization; not hydrated
Origin of anhydrousClassical Greek anydros ; from an-, without + hydōr, water
Without water, especially water of crystallization.
Origin of anhydrousFrom Greek anudros : an-, without; see a–1 + hudōr, water; see wed-1 in Indo-European roots.
(comparative more anhydrous, superlative most anhydrous)