Definitions

1. adjective

relating to or denoting a gun barrel of smaller calibre than the cartridge fired from it, used especially in artillery to fire a shell of larger calibre.

“The subcaliber gun was designed for increased firepower in a compact package.”

2. noun

a gun barrel of smaller calibre than the cartridge fired from it, used especially in artillery to fire a shell of larger calibre.

“The subcaliber round was successfully fired from the new artillery piece.”