The Collaborative International Dictionary of English v.0.48:

Bolter \Bolt"er\, n.
   One who bolts; esp.:
   (a) A horse which starts suddenly aside.
   (b) A man who breaks away from his party.
       [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Bolter \Bolt"er\, n.
   1. One who sifts flour or meal.
      [1913 Webster]

   2. An instrument or machine for separating bran from flour,
      or the coarser part of meal from the finer; a sieve.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Bolter \Bolt"er\, n.
   A kind of fishing line. See Boulter.
   [1913 Webster]