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arroyo a steep ditch carved in a plain or desert by the force of running water. Arroyos are usually dry except after a heavy rainfall.
arsenal a building used for storing weapons and ammunition.
arsenic a poisonous substance that is one of the chemical elements. It can be either grayish white, yellow, or black. (symbol: As)
arson the crime of burning buildings on purpose.
art the creation of things whose purpose is to be beautiful or full of meaning. [4 definitions]
artefact another spelling of artifact.
artery a blood vessel that carries blood away from the heart. [2 definitions]
arthritis a disease of the joints in which they swell and become painful.
arthropod a large group of animals with hard shells on the outsides of their bodies, legs with joints, and no bones inside their bodies. Insects, spiders, centipedes, and crabs are arthropods.
artichoke a plant like a tall thistle with a flower head made up of thick leaves. The head of the artichoke is eaten as a vegetable.
article a single thing; one item out of a group of similar objects. [4 definitions]
articulate able to speak or express oneself in a clear way. [2 definitions]
articulated lorry a British word for a very large truck that consists of a cab where the driver sits and a trailer that carries goods over long distances. Articulated lorry often has the same meaning as tractor-trailer.
artifact any object made by human beings.
artificial made by human beings; not natural. [2 definitions]
artificial intelligence an area of computer science that explores the ability of computers to think or have intelligence. Artificial intelligence is concerned with developing computer programs or computers that seem to use reason and make decisions.
artificial respiration the forcing of air into and out of the lungs of a person who has stopped breathing.
artillery large weapons used in land battles, such as cannons or rockets. Artillery is too heavy for a person to carry and is sometimes mounted on wheels. [2 definitions]
artisan a person skilled in making things, especially by using the hands. People such as those who make furniture, quilts, or other crafts are artisans.
artist a person who is good at painting, music, writing, or any other art. [2 definitions]
artistic having to do with art or artists. [2 definitions]