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amphetamine a drug that stimulates the central nervous system, depressing appetite and heightening activity.
anastomose to connect, either by natural branching growth or by surgery (parts of a blood vessel, nerve, or any branching system).
ancien régime any former political and social system. [1/2 definitions]
android (cap.) an operating system developed by Google that is used for mobile devices such as smartphones and tablets. [3/4 definitions]
anticyclone a large system of winds that rotates around a center of high barometric pressure, moving clockwise in the Northern Hemisphere and counterclockwise in the Southern, and usu. producing cool, dry weather. (Cf. cyclone.)
antiestablishment opposed to the established hierarchy, system, or leadership of a large government, corporation, church, or the like.
apothecaries' measure a system of fluid measure used to dispense liquid drugs.
apothecaries' weight a system of weights used to dispense drugs.
Appalachian Mountains mountain system in eastern North America extending from southeastern Canada to central Alabama in the United States; Appalachians.
apparatus any system, such as a political organization, that is designed to accomplish a specific purpose. [1/2 definitions]
arcuation a system, row, or grouping of arches. [1/3 definitions]
assimilate of food, to be or become absorbed into an organism's system. [1/8 definitions]
autoimmune characterized by or relating to a condition in which normal cells are attacked by the body's own immune system.
automate to convert to a mechanical or electronic system of operation. [2/3 definitions]
autonomic in physiology, of or relating to the autonomic nervous system. [1/3 definitions]
autonomic nervous system the part of the nervous system in vertebrates that controls involuntary bodily processes, such as the operation of the heart, stomach, and glands; sympathetic and parasympathetic nervous systems together.
avdp. abbreviation of "avoirdupois," a system of weight based on a pound equal to sixteen ounces or to 453.59 grams.
avoirdupois weight a system of weight based on a pound equal to sixteen ounces or to 453.59 grams.
AWACS an aircraft fitted with a radome and carrying sophisticated radar and computer equipment, used for reconnaissance and for directing ground forces, or a warning system employing such aircraft (acronym for "Airborne Warning and Control System").
baroreceptor a nerve ending sensitive to blood pressure that helps regulate the dilation of blood vessels in the circulatory system.
basis a particular system, mode of operation, standard, or guiding principle that underlies the way something else is established, decided on, or managed. [1/3 definitions]