Definition of megadeath in English:

megadeath

Syllabification: meg·a·death
Pronunciation: /ˈmegəˌdeTH
 
/

noun

A unit used in quantifying the casualties of nuclear war, equal to the deaths of one million people.
More example sentences
  • We're talking megadeaths, if not outright extinction!
  • Dr. Caldicott retreated to the outback, but she left a legacy of tremendous mass awareness about the threat of nuke megadeath and planetcide.

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Word of the day conspicuous
Pronunciation: kənˈspikyo͞oəs
adjective
standing out so as to be clearly visible