The definition of anhydrous is without water.
(adjective)Gaseous ammonia and gaseous hydrogen chloride are examples of anhydrous substances.
See anhydrous in Webster's New World College Dictionary
adjective
Origin: Gr anydros < an-, without + hydōr, water
See anhydrous in American Heritage Dictionary 4
adjective
Origin:
Origin: From Greek anudros
Origin: : an-, without; see a-1
Origin: + hudōr, water; see wed-1 in Indo-European roots
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