megadeath

[ meg-uh-deth ]
/ ˈmɛg əˌdɛθ /

noun

a unit of one million deaths: used in estimating or predicting the fatalities that would occur in a nuclear war.

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Origin of megadeath

First recorded in 1950–55; mega- + death
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for megadeath

megadeath
/ (ˈmɛɡəˌdɛθ) /

noun

the death of a million people, esp in a nuclear war or attack
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