N-bomb (?n?b?m?)n. A neutron bomb.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.neu?tron bomb` n. a nuclear weapon designed to release an intense burst of neutrons and gamma rays, with a weaker blast wave and less residual radiation than other nuclear bombs. [1955?60] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.