Russian тук

← Old East Slavic тукъ (inherited)

← Proto-Slavic *tukъ (inherited)

→ English thigh (cognate)

→ Old English þeoh (cognate)

→ Lithuanian taukai (cognate)

→ Old Norse þjó (cognate)

→ Old Saxon thioh (cognate)

→ Russian тучный (affix)