Definition of "surface-to-air" [surface-to-air]

• Fired from the ground, or from a ship, at an aircraft in flight, or at an incoming missile (adjective)

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• "Who do you think will be taking out Gaddafi's surface-to-air missiles and other antiaircraft infrastructure?"
• ""But of course, if there is just one surface-to-air missile that is of a decent enough range, and is active, then that does present a threat.""
• "It is very, very complicated and it will be expensive and possibly dangerous because the Libyans have - at least on paper - at least 200 surface-to-air missiles, some of them very capable, older systems, particularly the Soviet SA-6."