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subcalibre

British  
/ sʌbˈkælɪbə /

adjective

  1. (of a projectile) having a calibre less than that of the firearm from which it is discharged and therefore either fitted with a disc or fired through a tube inserted into the barrel

  2. of, relating to, or firing subcalibre projectiles

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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