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An explosive mailed in an envelope rigged to cause detonation upon being opened.
a thin explosive device inside an envelope, detonated when the envelope is opened
an envelope containing an explosive device designed to detonate when the envelope is opened.
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|Noun||1.||letter bomb - a thin explosive device inside an envelope or package and detonated when opened|
bomb - an explosive device fused to explode under specific conditions
|Verb||1.||letter bomb - send an explosive to; "The Unabomber letter bombed a number of individuals and institutions"|