drilling
dril.ling \'dril-in\ n [modif. of G drillich, fr. MHG drilich fabric woven with a threefol]d thread, fr. OHG drili-h made up of three threads, fr. L trilic-, trilix, fr. tri- + licium thread : DRILL
dril.ling \'dril-in\ n [modif. of G drillich, fr. MHG drilich fabric woven with a threefol]d thread, fr. OHG drili-h made up of three threads, fr. L trilic-, trilix, fr. tri- + licium thread : DRILL