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Aa

(ä) [from a word for "water" of the same Indo-European root as Lat. aqua], name of many small streams of N Europe and Switzerland. Aa, or a derivative of it, is a component part of hundreds of European place names.

aa

(ä`ä): see lavalava
, molten rock that erupts on the earth's surface, either on land or under the ocean, by a volcano or through a fissure. It solidifies into igneous rock that is also called lava.
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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/

aA

(electricity)

AA

(ordnance)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

AA

Abbr. for the “Architectural Association, ” the largest school of architecture in England; address 34–36 Bedford Square, London, WC1B 3ES.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

AA

(1) (Auto Answer) See modem.

(2) A telephone answering system with voice prompts. See automated attendant.

(3) (Double A) A common single-cell battery used in myriad devices from flashlights to electronic equipment of all variety. Like its triple A (AAA) cousin, it provides 1.5 volts of DC power. When used in series, the voltage is multiplied. For example, four AA batteries yield 6 volts.
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References in periodicals archive ?
The anesthesia machine or Boyle's machine is a medical care equipment used by anesthesiologist assistants, anesthesiologists and nurse anesthetists to facilitate the administration of anesthesia.
North Florida Anesthesia is comprised of over 70 physicians, certified registered nurse anesthetists and anesthesiologist assistants, who provide services to 18 facilities in Florida.
The CRNAs reached a compromise with the Anesthesiologist Assistants (AA) in HB54 to keep AAs practice limited to the largest hospitals in the State.