SMOOTHBORE
unrifled, smoothbore
(adjective) of a firearm; not having rifling or internal spiral grooves inside the barrel
smoothbore
(noun) a firearm that has no rifling
Source: WordNet® 3.1
Etymology
Adjective
smoothbore (not comparable)
(firearms) having a bore with a smooth interior, ie. one that has not been rifled
Synonyms
• unrifled
Antonyms
• rifled
Noun
smoothbore (plural smoothbores)
(firearms) a cannon, gun or other firearm that has an unrifled barrel.
Anagrams
• bothrosome
Source: Wiktionary
Smooth"bore`, a. (Gun.)
Definition: Having a bore of perfectly smooth surface; -- distinguished
from rifled.
– n.
Definition: A smoothbore firearm.
Source: Webster’s Unabridged Dictionary 1913 Edition