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An emergency field ration for US armed forces in World War II, consisting of a single packaged meal.
[After Ancel Benjamin Keys (1904-2004), American physiologist.]
(Military) a small package containing emergency rations used by US and Allied forces in the field in World War II
[C20: K, from the initial of the surname of Ancel Keys (1904–2004), US physiologist who instigated it]
an emergency military field ration for use under combat conditions, consisting of three separate packaged meals. Compare C ration.
[1940–45; K for Ancel Keys (born 1904), U.S. physiologist]