O.E. sweart "black," from P.Gmc. *swartaz (cf. O.Fris., M.Du. swart, O.N. svartr, Ger. schwarz, Goth. swarts "dark-colored, black"), from PIE base *swordo- "dirty, dark, black" (source of sordid). The true Gmc. word for "black," surviving in the Continental languages.