Webster's English Dictionary

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twill

1. twill \'twil\ n [ME twyll, fr. OE twilic having a double thread, modif. 
   of L bil]ic-, bilix, fr. bi- + licium thread 1: a fabric with a twill weave 
    2: a textile weave in which the filling threads pass over one and under 
   two  or more warp threads to give an appearance of diagonal lines
2. twill vt : to make (cloth) with a twill weave