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22nd Amendment an amendment to the U.S. Constitution that ensures that no person can be elected to more than two four-year terms as President of the United States. The 22nd Amendment, ratified in 1951, was passed in reaction to President Franklin D. Roosevelt's four terms in office.
absolute temperature temperature measured on a scale in which zero equals the lowest temperature that can be obtained physically.
actinic rays electromagnetic radiation, such as x-rays or ultraviolet light, that can produce an image on a photographic emulsion.
adenoid (usu. pl.) a mass of tissue between the nose and the throat that, when swollen, can hinder breathing. [1/2 definitions]
agitator a machine, or part of a machine, that automatically shakes or stirs things together, as in a can of paint or a washing machine. [1/2 definitions]
aircraft any man-made vehicle that can fly through the air, such as an airplane, helicopter, glider, or balloon.
aircraft carrier a very large warship with a flat upper deck on which airplanes can take off and land.
air lock an airtight compartment in which the air pressure can be regulated, usu. situated between two areas that have different air pressures, as in underwater operations. [1/2 definitions]
air pocket a downward air current that can cause an abrupt change, usu. a drop, in an aircraft's altitude.
airport a large area of level land where airplanes can land and take off, usu. including a passenger terminal and cargo and repair facilities.
air shaft a narrow vertical passage through which fresh air can reach an otherwise enclosed area such as the interior of a building; ventilating shaft.
Aladdin in The Arabian Nights, a boy who finds a magic lamp and ring, each of which enables him to bring forth a powerful genie who can grant his every wish.
alarm clock a clock with a bell or buzzer that can be set to sound at a chosen time.
album a book or binder with blank pages or empty pockets in which a collection can be inserted, as of photographs, stamps, or mementos. [1/3 definitions]
alkali metal any of a group of highly reactive chemical elements, such as sodium and potassium, that are typically univalent cations forming various compounds, but that can be isolated as soft, low-density metals.
anaconda any of several large nonvenomous constrictor snakes, esp. a certain South American tree snake that can grow to over twenty feet in length.
anchorage a place where vessels can anchor. [1/4 definitions]
animism the belief that spiritual beings or souls can exist without a body to house them. [1/3 definitions]
antimere either of the corresponding parts that can be the result of dividing an animal symmetrically.
aquifer a bed of rock, sand, or gravel that can hold great quantities of water and supplies it to wells and springs.
armful the quantity that can be carried by one arm or in the arms.