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Entry 1 sense Webster, 1913

Subcaliber

· Sub·cal·i·ber · IPA
01 a. Smaller than the caliber of a firearm.
  1. 1.
    Smaller than the caliber of a firearm.
Phrases & compounds
Subcaliber projectile — a projectile having a smaller diameter than the caliber of the arm from which it is fired, and to which it is fitted by means of a sabot.