資料來源 : Webster's Revised Unabridged Dictionary (1913)

Subcaliber \Sub*cal"i*ber\, a.
   Smaller than the caliber of a firearm. [Written also
   {subcalibre}.]

   {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.
      --Knight.