þrǣl m
From Old Norse þræll (Danish træl, Swedish träl), perhaps from Proto-Norse *þrāhilaʀ, from Proto-Germanic *þragilaz, *þrahilaz, *þrēhilaz, from *þreh-, *þreg-, *þrag- ‘to run’, from Proto-Indo-European *trāgʰ- (“pull, drag, race, run”).