purl
1. purl \'p*r(-*)l\ n [obs. pirl (to twist)] 1: gold or silver thread or wire for embroidering or edging 2: the intertwist of thread knotting a stitch usu. along an edge 2. purl vt 1a: to embroider with gold or silver thread 1b: to edge or border with gold or silver embroidery 2: to knit in purl stitch : to do knitting in purl stitch 3. purl n [perh. of Scand origin; akin to Norw purla to ripple] 1: a purling or swirling stream or rill 2: a gentle murmur or movement (as of purling water) 4. purl vi 1: EDDY, SWIRL 2: to make a soft murmuring sound like that of a purling stream
Webster's English Dictionary