nuclear bag

nu·cle·ar bag

the aggregation of nuclei occurring in the nonstriated center of an intrafusal muscle fiber of a neuromuscular spindle.
Farlex Partner Medical Dictionary © Farlex 2012
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In 2013, North Korea did not display other ICBMs from its lineup in the military parade, but drew attention by displaying what it called its "nuclear bag." The small nuclear weapons, often dubbed dirty bombs, can irradiate target areas.
Nevada May End Up Holding the Nuclear Bag. New York Times, December 20.