{ } 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.

{ } a. Of or pertaining to the family or the faction of the Guelphs. [ 1913 Webster ]