无水 wúshuǐ anhydrous Origin Definitions Defs Strokes Stroke Words Sentences Sents 无水石膏 wúshuǐshígāo anhydrite anhydrous calcium sulfate, occurring naturally as a mineral or produced by heating gypsum; plaster of Paris无水酸 wúshuǐsuān acid anhydride a chemical compound derived from an acid by removing water molecules