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aa noun

  /ˈɑ.ɑ/ , /ˈɑː.ɑː/ , [ˈɑ.ʔɑ] , [ˈɑː.ʔɑː]
  • (volcanology) A form of lava flow associated with Hawaiian-type volcanoes, consisting of basaltic rock, usually dark-colored with a jagged and loose, clinkery surface. Compare pahoehoe. [From 19th c.]
 scherpe lava

AA properNoun

  • Initialism of Alcoholics Anonymous: a self-supporting organization of alcoholic people.
 AA
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