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ground zero noun

  /-ˈzi(ˌ)ɹoʊ/ , /ˌɡɹaʊnd ˈzɪəɹəʊ/ , /ˌɡɹaʊnd ˈzɪɚ(ˌ)oʊ/
  • Originally, the point on the land or water surface below which a nuclear bomb detonates in the air; now also the point on such a surface at or above the detonation.
point zéro
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