lacquer UK /ˈlæk.ə/US /ˈlæk.ɚ/noun 1verb 1forms 3 noun1 •A glossy, resinous material used as a surface coating; either a natural exudation of certain trees, or a solution of nitrocellulose in alcohol, etc.Had he deemed it "wisest, best," Mr. O'Donagough was not without the means of furnishing a splendid mansion in very showy style, and yet not leaving a single morsel of lacker, or or-molu, unpaid for. — 1840 verb1 •To apply a lacquer to something or to give something a smooth, glossy finish. formslacquered · lacquering · lacquers