an·ti·bal·lis·tic missile /ˌæntɪbəˈlɪstɪk, ˌænˌtaɪ-/
  antiballistic missile
       n : a defensive missile designed to shoot down incoming
           intercontinental ballistic missiles; "the Strategic Arms
           Limitation Talks placed limits on the deployment of ABMs"
           [syn: ABM]