How do you spell Bolter

Available Definitions:
1)  n. - One who bolts; esp.: (a) A horse which starts suddenly aside. (b) A man who breaks away from his party.
2)  n. - One who sifts flour or meal.
3)  n. - An instrument or machine for separating bran from flour, or the coarser part of meal from the finer; a sieve.
4)  n. - A kind of fishing line. See Boulter .