Meaning of fractional orbital bombardment system

frac'tional or'bital bombard'ment sys"tem

Pronunciation: [key]
  1. a missile or satellite with a nuclear warhead sent into a low orbit so that it can suddenly be directed at a target. Abbr.: FOBS, F.O.B.S.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.