aa

Noun

aa (uncountable)

1. A form of lava flow of basaltic rock, usually dark-colored with a jagged and loose, clinkery surface. It is one of two chief forms of lava flow emitted from volcanoes of the Hawaiian type, the other form being pahoehoe.

   Quotations

   • 1859 - R. C. Haskell in American journal of science and arts, series XXVIII

     We...saw "pahoihoi" or solid lava forming, and also "aa" or clinkers.

   • 1883 - Clarence E. Dutton in the fourth Annual report of the United States Geological Survey

     The second form of the lavas is called by the natives a-a, and its contrast with pahoehoe is about the greatest imaginable. It consists mainly of clinkers sometimes detached, sometimes partially agglutinated together with a bristling array of sharp, jagged, angular fragments.

   • 1944 - Charles A. Cotton: Volcanoes as landscape forms

     Cooling and solidification frequently takes a different course...in lava flows, producing the clinker-like "aa" lava.

2 letters in word "aa": A A.

No anagrams for aa found in this word list.

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• A type of lava surface in which the surface was too stiff to flow well, and so broke up into fragments. It is characterised by broken material which can vary from simple lumps to very sharp prickly fragments. It grades to pahoehoe (qv).
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• Aa is a digraph that occurs in some languages, e.g. in the Dutch alphabet.

• aa
• → aah
• → aahed
• → aahing