Antiaircraft defence protects cities, military installations, ships, troops, and other targets from attack by enemy aircraft or missiles.
Antibiotic is a drug produced by certain microorganisms.
Antichrist is a power or person opposed to Jesus Christ.
Anticoagulant is a chemical substance used to prevent the normal coagulation (clotting) of blood.
Antidote is a substance that fights the harmful action of poison in the body.
Antifreeze is a substance that is added to a liquid to lower its freezing point.
Antigone, in Greek mythology, was the daughter of King Oedipus and Queen Jocasta, the rulers of Thebes.
Antigonid dynasty was the name of a line of kings that ruled Macedonia, a kingdom north of Greece.
Antigravity is a hypothetical force of repulsion.
Antigua and Barbuda is an independent island country in the Caribbean Sea.
Antihistamine is a drug used to relieve the symptoms of hay fever and other allergies.
Antimatter is matter composed of elementary particles that are the opposite of ordinary particles.
Antimony, a chemical element, is a bluish-white, brittle metal.
Antineutron is the oppositely charged counterpart of the neutron.
Antioxidant is any of a group of chemical compounds that may prevent certain types of cell damage.
Antipodes are two places that are exactly opposite each other on the globe.
Antiproton is the oppositely charged counterpart of the proton.
Antique is an object many years old that has artistic value.
Anti-Semitism is prejudice against Jews.
Antiseptic is a substance that destroys–or stops the growth of–germs on living tissue.
Antitoxin is a substance made by living cells that counteract illness caused by a toxin.
Antitrust laws were introduced in the United States to protect competition.
Antonym is a word that has the opposite meaning of another word.
Antpipit is the name of two species of pipit-like birds from South America.
Anubis was an important god of the underworld among the ancient Egyptians.
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