from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Having a smooth bore. Used of a gun barrel.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Having a bore with a smooth interior, i.e. one that has not been rifled
from The Century Dictionary and Cyclopedia
- Not rifled; not robbed; not stripped.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. of a firearm; not having rifling or internal spiral grooves inside the barrel
un- + rifled (Wiktionary)