Learn That Word

Synonyms for Antiaircraft (same or very similar meaning)

WordNet sense 1 (artillery designed to shoot upward at airplanes):
flack, flak, ack-ack, pom-pom, ack-ack gun, antiaircraft gun

WordNet sense 2 (intended or appropriate for defending against or deterring aggression or attack):
defensive


From the ODE community, based on WordNetadd/edit