megadeath (n.)

"the death of one million persons" as a measure of the effectiveness of nuclear weapons, 1953, from mega- in scientific sense ("one million") + death (n.) "a dying." The resulting one million dead bodies would be a megacorpse, according to writings on the topic.

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Definitions of megadeath

megadeath (n.)
the death of a million people;
they calibrate the effects of atom bombs in megadeaths