noun one who sifts flour or meal.
2. bolter ·noun a kind of fishing line. ·see boulter.
3. bolter ·noun one who bolts; ·esp.: (a) a horse which starts suddenly aside. (b) a man who breaks away from his party.
4. bolter ·noun an instrument or machine for separating bran from flour, or the coarser part of meal from the finer; a sieve.