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letter bomb

noun
1.
an envelope containing an explosive device designed to detonate when the envelope is opened by the recipient.
Also called mail bomb.
Origin
1945-1950
1945-50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for letter bomb

letter bomb

noun
1.
a thin explosive device inside an envelope, detonated when the envelope is opened
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Difficulty index for letter bomb

Few English speakers likely know this word

Word Value for letter

6
7
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