AA in German
AA in German
AA
Initialism of Alcoholics Anonymous: a self-supporting organization of alcoholic people.
Aa-Lava
(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.]
Brockenlava
(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.]