atomic bomb definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
an extremely destructive type of bomb, the power of which results from the immense quantity of energy suddenly released when a very rapid chain reaction of nuclear fission is set off by neutron bombardment in the atoms of a charge of plutonium (primarily Pu-239) or uranium (U-235): first used in warfare (1945) by the United States against the Japanese cities of Hiroshima and Nagasaki
atomic bomb definition by American Heritage Dictionary
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
See atom bomb.
atomic bomb - Cultural Definition
A bomb that is powered by nuclear fission, and therefore produces a quick release of energy and great destruction.
The New Dictionary of Cultural Literacy Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
atomic bomb - Science Definition
A very destructive bomb that derives its explosive power from the fission of atomic nuclei. Atomic bombs usually have plutonium 239 or uranium 235 as their fissionable material. Also called atom bomb.