anticonvulsant UK /ˌæn.tɪ.kənˈvʌl.sənt/US /ˌæn.ti.kənˈvʌl.sənt/adjective 1noun 1forms 1 adjective1 •Acting as an anticonvulsant. noun1 •An agent that prevents, stops, or lessens convulsions. formsanticonvulsants