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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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aA

(electricity)

AA

(ordnance)

AA

Abbr. for the “Architectural Association, ” the largest school of architecture in England; address 34–36 Bedford Square, London, WC1B 3ES.

AA

(1) (Auto Answer) See modem.

(2) (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.
References in periodicals archive ?
Or the Big Island--losing myself in the volcanoes, looking for where the earth bleeds fire between patches of pahoehoe and a'a lava formations.
The smoother rock," Mark told the boys earlier in his penetrating voice, using the Hawaiian terms and pronunciation, "is Pahoehoe, and the sharper, jagged stuff is A'a.
Analysts termed the agreement A'a win win solution' for both parties.
The typical feature of this volcano is that it produces ' a'a lava' that has a rough surface and cracks all over.