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O.E. furšor (adv.), furšra (adj.), (ge)fyršan (v.) "further, impel," etymologically representing either "forth-er" or "fore-ther." The former would be from furšum (see forth) + comp. suffix *-eron-, *-uron- (cf. inner, outer). Alternative etymology traces it to P.Gmc. *furžeron-, from PIE *pr-tero, (cf. Gk. proteros "former"), from root of fore + comp. suffix also found in after, other. Senses of "in addition, to a greater extent" are later metaphoric developments. Furthermore is from c.1200.