Word Origin & History
thighO.E. þeoh, þeh, from P.Gmc. *theukhom (cf. O.Fris. thiach, O.Du. thio, Du. dij, O.N. þjo, O.H.G. dioh), from PIE *teuk- from base *teu- "to swell" (cf. Lith. taukas, O.C.S. tuku, Rus. tuku "fat of animals;" Lith. tukti "to become fat;" Gk. tylos "callus, lump," tymbos "burial mound,
grave, tomb;" O.Ir. ton "rump;" L. tumere "to swell," tumulus "raised heap of earth," tumor "a swelling;" M.Ir. tomm "a small hill," Welsh tom "mound"). Thus thigh is lit. "the thick or fat part of the leg."