The Collaborative International Dictionary of English v.0.48:

Thrown \Thrown\ (thr[=o]n),
   a. & p. p. from Throw, v.
   [1913 Webster]

   Thrown silk, silk thread consisting of two or more singles
      twisted together like a rope, in a direction contrary to
      that in which the singles of which it is composed are
      twisted. --M'Culloch.

   Thrown singles, silk thread or cord made by three processes
      of twisting, first into singles, two or more of which are
      twisted together making dumb singles, and several of these
      twisted together to make thrown singles.
      [1913 Webster]