twill /twɪl/ BrE AmE noun [uncountable]
[ Date: 1300-1400 ; Language: Old English ; Origin: twilic 'having a double thread' , from twi- ( ⇨ ↑ twilight ) + -lic (from Latin bilix , from bi- ( , ↑ bi- ) + licium 'thread' ) ]
strong cloth woven to produce parallel sloping lines across its surface:
grey twill trousers