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Definition of K rations noun from the Oxford Advanced Learner's Dictionary

 

K rations

 noun
noun
BrE
 
; NAmE
 
[plural] (North American English)
 
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special meals given to US soldiers during World War II. They were named after Dr Ancel Keys, the leader of the group that created them. The food was supplied in three boxes, one each for breakfast, lunch and dinner, and each contained a healthy number of calories (= units of energy) and vitamins, as well as four cigarettes.