polyurethane noun 1verb 1forms 3 noun1 •Any of various polymeric resins containing urethane links; used in many industrial and domestic applications.Firefighters were hampered by toxic fumes from polyurethane mattresses and overstuffed furniture. — 1977 verb1 •To coat (a floor etc.) with polyurethane. formspolyurethaned · polyurethaning · polyurethanes