1. The point of detonation (or above or below) of a nuclear weapon
   "The effects of radiation were most severe at ground zero"
    
2. The target of a projectile (as a bomb or missile)
   "The explosion left a crater at ground zero"

1. The site of the World Trade Center before it was destroyed
   - World Trade Center site

Derived forms: Ground Zeros

Type of: land site, point, site, target, target area

Part of: Big Apple [informal], Gotham [US, informal], Greater New York, New York, New York City, NYC

Encyclopedia: Ground zero