The crossword solution for the term 'LAB SOLVENT' is 'ACETONE', which is a seven-letter word. ACETONE is a colorless, volatile, flammable liquid that is used as a solvent in many laboratory and industrial processes. It is also used as a paint stripper, nail polish remover, and to make plastics and other synthetic materials. ACETONE is a common ingredient in many household products, such as cleaners, polishes, and adhesives.