The Collaborative International Dictionary of English v.0.48:

Harl \Harl\ (h[aum]rl), n. [Cf. OHG. harluf noose, rope; E.
   hards refuse of flax.]
   1. A filamentous substance; especially, the filaments of flax
      or hemp.
      [1913 Webster]

   2. A barb, or barbs, of a fine large feather, as of a peacock
      or ostrich, -- used in dressing artificial flies. [Written
      also herl.]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Herl \Herl\, n. (Zool.)
   Same as Harl, 2. Herling