anhydrous

an- +‎ Ancient Greek ὕδωρ (húdōr, “water”) +‎ -ous.

anhydrous (comparative more anhydrous, superlative most anhydrous)

1. Having little or no water.
2. (physical chemistry) Having no water of crystallization.
   • 1997, A. J. Taylor, D. S. Mothram, editors, Flavour Science: Recent Developments‎, Elsevier, →ISBN, page 63:

     Volatiles of kecap manis and its raw materials were extracted using Likens-Nickerson apparatus with diethyl ether as the extraction solvent. The extracts were then dried with anhydrous sodium sulfate, concentrated using a rotary evaporator followed by flushing using nitrogen until the volume was about 0.5 ml.

• nonanhydrous