from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Designed for defense, especially from a surface position, against aircraft or missile attack.
- n. An antiaircraft weapon.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Intended to attack aircraft.
- n. Antiaircraft artillery.
- n. An antiaircraft artillery organization.
- n. Antiaircraft fire.
anti- + aircraft. (Wiktionary)