anti-aircraft

• antaircraft (rare)
• antiaircraft

From anti- +‎ aircraft.

anti-aircraft (not comparable)

1. (military) Intended to attack aircraft.
   • 1947 January and February, “Wartime Traffic at Tanfield, L.N.E.R.”, in Railway Magazine, page 47:

     Special lamps were provided for working during the blackout, and an anti-aircraft gun, manned by the R.A.O.C., was mounted on the coal depot line.

   • 2007 September 25, Bungie, Halo 3, spoken by Miranda Keyes (Justis Bolding), Microsoft Game Studios, Xbox 360, level/area: Crow's Nest:

     Truth's ships are clustered above the excavation site. And his infantry has deployed anti-aircraft batteries around the perimeter.

• The hyphenated form is more common in the British corpus while the solid form is more common in the American corpus.^[1] GPO manual item 6.29. recommends to spell anti- prefixed words without a hyphen unless an overriding consideration applies.^[2]

• AA, double-A
• AAA, triple-A
• ack-ack
• air-defence, air-defense
• anti-air
• surface-to-air

anti-aircraft (countable and uncountable, plural anti-aircraft or anti-aircrafts)

1. (military) Anti-aircraft artillery.
   • 1944 June 3, Charles A. Lindbergh, The Wartime Journals of Charles A. Lindbergh, New York: Harcourt Brace Jovanovich, published 1970, page 839:

     I am blacking out—ease the stick forward slightly—the sky is clear again—I turn out over water—reverse turn—there are antiaircraft on the island below—I reverse again—and again.

2. (military) An anti-aircraft artillery organization.
3. (military) Anti-aircraft fire.

• AA, double-A
• AAA, triple-A
• ack-ack
• air defence, air defense
• Archie

• Anti-aircraft warfare on Wikipedia.Wikipedia