Wordnet 3.0
ADJECTIVE (1)
1.
of or relating to the bore of a gun (or its ammunition) that measures thirty-eight hundredths of an inch in diameter;
- Example: "a .38 caliber shell"[syn: .38 caliber, .38-caliber, .38 calibre, .38-calibre]
From WordNet (r) 3.0 (2006):