aa1
/ˈɑːɑː
/noun [mass noun] Geology
Basaltic lava forming very rough, jagged masses with a light frothy texture. Often contrasted with pahoehoe.Roads of black ash traverse it, winding through the otherwise untraversable aa....
- A serpentine flow meanders through formations of smooth pahoehoe lava and rough aa lava, the same forms common in basalt lavas.
- Very different from jagged aa, pahoehoe is the other general texture of newly solidified lava.
Origin
Mid 19th century: from Hawaiian 'a-'a.
AA2
/eɪˈeɪ/abbreviation
1Alcoholics Anonymous.
2Anti-aircraft.
3(In the UK and South Africa) Automobile Association.
- queen's bishop
- Queen's bounty
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- Queen's Chain
- queen's chair
- Queen's Champion
- queen's china
- queen's cloth
- Queen's colour
- queen's conch
- Queen's Counsel
- Queen's County
- queen's cushion
- queen's delight
- Queen's English
- Queen's evidence
- queen's evil
- queen's flower
- queen's gambit
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- Queen's Guide
- Queen's highway
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- queenside
- queen-size