WordReference Random House Learner's Dictionary of American English © 2014
ˈneu•tron ˌbomb, n. [countable]
a nuclear weapon designed to release a powerful burst of neutrons and gamma rays, with a weaker blast wave than other nuclear bombs.

Collins Concise English Dictionary © HarperCollins Publishers::

neutron bomb n
  1. a type of nuclear weapon designed to provide a high yield of neutrons but to cause little blast or long-lived radioactive contamination. The neutrons destroy all life in the target area, which theoretically can be entered relatively soon after the attack
    Technical name: enhanced radiation weapon

'neutron bomb' also found in these entries:
In the English description:

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