'Guelf' definitions:

Definition of 'Guelf'

From: GCIDE

Guelph \Guelph\, Guelf \Guelf\ (gw[e^]lf), n. [It. Guelfo, from Welf, the name of a German family.] (Hist.) One of a faction in Germany and Italy, in the 12th and 13th centuries, which supported the House of Guelph and the pope, and opposed the Ghibellines, or faction of the German emperors. Guelphic