antiaircraft
an-ti-air-craft
adjective
Designed or used to defend against attacks by enemy aircraft.
"An antiaircraft gun was positioned on the roof."
noun
Weapons or systems used collectively to defend against enemy aircraft.
"The antiaircraft opened fire on the approaching bombers."
Thesaurus
Synonyms: defensive, flak, antiaircraft gun, flack, pom-pom, ack-ack, ack-ack gun