Definitions for "A'a"
(ah-ah)...(n.)...lava rock that one should avoid walking barefoot on or:...the verbalization a haole typically makes when walking barefoot on a'a lava rock
A Hawaiian term for basaltic lava flows that are typically rough and jagged with a clinkery surface.
A type of basalt lava flow characterized by an extremely rough clinkery top and a dense interior. A'a flows are usually 110 meters thick, have flow-front velocities between 10 and 2000 meters/hour, and are associated with high-fountaining high-effusion-rate eruptions.
Sirius, a guiding star