any of various canned or prepackaged foods used as field rations in the U.S. armed forces.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
tinned food formerly issued in packs to US soldiers
Word Origin for C rations
C20: C(ombat) rations
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