Etymology

megadeath

mega·death
M3E1G2A1D2E1A1T1H4

Today it means: One million deaths, especially as a unit of measure for estimating deaths due to nuclear warfare. Full definition →

First used mid 20th c.
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The story

PIE word *méǵh₂s From mega- (prefix meaning ‘one million; very large, great’) + death.

First known use, by meaning

  • from mid 20th c. One million deaths, especially as a unit of measure for estimating deaths due to nuclear warfare.

Etymology from Wiktionary, CC BY-SA 4.0.