purl1
  
  adj.
 (of a knitting stitch) made by putting the needle through the front of the stitch from right to left. Compare with 
plain1 (in sense 
5).
v.
 knit with a purl stitch.
 
  Etymology
  C17: of uncertain origin.
 
  
    
purl2
  
  v.
 (of a stream or river) flow with a swirling motion and babbling sound.
n.
 a motion or sound of this kind.
 
  Etymology
  C16 (denoting a small swirling stream): prob. imitative.