† ˈlibellize,v.Obs.rare. [f. libel n. + -ize.] intr. To deal in libels, to practice slander. c1620T. Robinson M. Magd. 4/27 To reprehend In sharpe-fang'd Satyres, is to libellize, To raise vile slaunders, and false infamies.1628Wither Brit. Rememb. 285 Such a president will hearten them To libellize.