Ampere is the unit used to measure the rate of flow of an electric current.
Amphetamine is any one of a group of synthetic drugs that stimulate the brain, increasing the user’s alertness and readiness for action.
Amphibian is an animal with scaleless skin that–with a few exceptions–lives part of its life in water and part on land.
Amphibious ship is a warship that lands troops, weapons, and vehicles on beaches during amphibious assaults.
Amphibious warfare, is the conduct of military operations by naval, air, and land forces for the purpose of seizing a beach or coastal area.
Amphibole is any of a group of common rock-forming minerals.
Amphioxus, also called lancelet, is a small sea animal that lives in shallow water.
Amputation refers to the surgical removal of a limb, part of a limb, or another part of the body.
Amulet is a charm that supposedly has magic power.
Amur River is a stream in eastern Siberia, formed by the joining of the Argun and Shilka rivers.
Amyotrophic lateral sclerosis, also called ALS, is a rare, incurable disease of the nervous system.
Anabaptists were one form of what has been called the radical wing of the Reformation of the 1500’s.
Anableps, also called four-eyed fish, is a small fish of tropical America that swims at the top of the water.
Anaconda is the name of two kinds of large snakes found in tropical South America.
Anaemia is a condition in which the number of healthy red blood cells falls below normal.
Anaesthesia is the loss of sensation-particularly that of pain in all or part of the body.
Anaesthetics is a branch of medicine that deals with the administration of drugs for the relief of pain and anxiety during surgery and childbirth.
Analgesic is any drug that relieves pain without causing unconsciousness.
Analog computer is a device that solves problems by working directly with a physical quantity, such as weight, voltage, or speed, rather than with digits that represent the quantity.
Analytical chemistry is a branch of chemistry that deals with the development and use of techniques for chemical measurement.
Ananias was a member of the early church at Jerusalem.
Anaphylactic shock, also called anaphylaxis, is a rare, life-threatening allergic reaction that affects the whole body.
Anarchism is a belief that every form of regulation or government is immoral, and that restraint of one person by another is an evil which must be destroyed.
Anatolian shepherd is a dog which descended from the ancient mastiff dogs of Asia Minor.
Anatomy is the study of the structure of plants, animals, and human beings.
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