"threads running lengthwise in a fabric," O.E. wearp-, from P.Gmc. *warpo- (cf. M.L.G. warp, O.H.G. warf "warp," O.N. varp "cast of a net"), from root *werp- (see
warp (v.)). The warp of fabric is that across which the woof is "thrown." Applied in 20c. astrophysics to the "fabric"