The Collaborative International Dictionary of English v.0.48:

Heddle \Hed"dle\, n.; pl. Heddles. [Cf. Heald.] (Weaving)
   One of the sets of parallel doubled threads which, with
   mounting, compose the harness employed to guide the warp
   threads to the lathe or batten in a loom.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Heddle \Hed"dle\, v. t.
   To draw (the warp thread) through the heddle-eyes, in
   weaving.
   [1913 Webster]