| Noun | 1. | acetone - the simplest ketone; a highly inflammable liquid widely used as an organic solvent and as material for making plasticsketone - any of a class of organic compounds having a carbonyl group linked to a carbon atom in each of two hydrocarbon radicals dissolvent, dissolver, dissolving agent, resolvent, solvent - a liquid substance capable of dissolving other substances; "the solvent does not change its state in forming a solution" |