plastisol Syllabification: (plas·ti·sol)Pronunciation: /ˈplastəˌsôl, -ˌsäl/Definition of plastisol noun a liquid substance that can be converted into a solid plastic simply by heating, consisting of particles of synthetic resin dispersed in a nonvolatile liquid. Origin: 1940s: from the noun plastic + sol2plastisol in other Oxford dictionaries Definition of plastisol in the British & World English dictionary