Definition of "subcaliber" [sub•cal•i•ber]

• Smaller in caliber than the barrel of the gun from which it was fired. Used of projectiles. (adjective)
• Of or relating to such projectiles. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.