Dictionary.com
definitions

Springfield rifle

noun
  1. a single-shot, breechloading .45-caliber rifle used by the U.S. Army from 1867 to 1893.
  2. Also called Springfield 1903. a bolt-operated, magazine-fed, .30-caliber rifle adopted by the U.S. Army in 1903 and used during World War I.
  3. a single-shot, muzzleloading rifle of .58-inch caliber, used by the Union Army during the Civil War.

Origin of Springfield rifle

after Springfield, Mass., site of a federal armory that made the rifles
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for springfield rifle

Springfield rifle

noun
  1. a magazine-fed bolt-action breech-loading .30 calibre rifle formerly used by the US Army

Word Origin for Springfield rifle

from Springfield, Massachusetts
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