Home › Words › G › guillelmiteguillelmiteguillelmite · noun — synonym of Williamite (“member of the Hermits of Saint William”).Definition from Wiktionary (CC BY-SA 3.0).EtymologyFrom French guillelmite. By surface analysis, Latin Guillelmus + -ite.nounSynonym of Williamite (“member of the Hermits of Saint William”).Synonym of Guglielmite.Definitions & examples from Wiktionary (CC BY-SA 3.0).