Wordnet 3.0
ADJECTIVE (1)
1.
of or relating to the bore of a gun (or its ammunition) that measures twenty-two hundredths of an inch in diameter;
- Example: "a .22 caliber pistol"[syn: .22 caliber, .22-caliber, .22 calibre, .22-calibre]
From WordNet (r) 3.0 (2006):