Guibertine adjective 1noun 1forms 1 adjective1 •(historical) Relating to Guibert of Ravenna (c. 1029 – 1100), antipope as Clement III from 1080 to 1100, and his supporters.Magninulph, an archpriest, was then elected by the Guibertine party, with the title of Sylvester IV., and died suddenly. — 1847 noun1 •(historical) A supporter of Guibert of Ravenna. formsGuibertines
