• synonyms


or a'a

See more synonyms for aa on Thesaurus.com
  1. basaltic lava having a rough surface.
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Compare pahoehoe.

Origin of aa

First recorded in 1855–60, aa is from the Hawaiian word ʿaʿā


  1. Fellow of the American Academy.
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Origin of A.A.S.1

From the New Latin word Academiae Americanae Socius


  1. American Academy of Sciences.
  2. Associate in Applied Science.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for aas

Contemporary Examples

Historical Examples

  • This clatter excepted and a few magnificent pairs of velvet breeches, the festival was the same as that at Aas.

    A Tour Through The Pyrenees

    Hippolyte Adolphe Taine

British Dictionary definitions for aas


  1. a volcanic rock consisting of angular blocks of lava with a very rough surface
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Word Origin



abbreviation for
  1. ana 1
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abbreviation for
  1. Alcoholics Anonymous
  2. anti-aircraft
  3. Architectural Association
  4. (in Britain) Automobile Association
  5. (in Britain) Advertising Association
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symbol for
  1. (in Britain, formerly) a film that may not be shown publicly to a child under fourteen
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

aas in Medicine


  1. Alcoholics Anonymous
  2. amino acid
  3. aminoacyl
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

aas in Science


  1. A type of lava having a rough, jagged surface. It is relatively slow moving in its molten state, advancing in the form of massive blocks with fissured and angular surfaces that ride on a viscous interior. The blocks range in size between the size of a football and the size of a house. See Note at pahoehoe.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.