a type of basalticrock, usually dark_colored with a jagged surface, formed in large sheets from slow_moving lava. It is one of two chief forms of rock emitted from volcanoes of the Hawaiian type, the other being pahoehoe.
AA
AA ("double A"), one of the standard sizes for dry cell batteries
This page expands a two-letter combination or a three-letter abbreviation/acronym (TLA). It aims to include all uses.
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