• synonyms


or a'a

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

Origin of aa

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


  1. Fellow of the American Academy.

Origin of A.A.S.1

From the New Latin word Academiae Americanae Socius


  1. American Academy of Sciences.
  2. Associate in Applied Science.
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

Word Origin



abbreviation for
  1. ana 1


abbreviation for
  1. Alcoholics Anonymous
  2. anti-aircraft
  3. Architectural Association
  4. (in Britain) Automobile Association
  5. (in Britain) Advertising Association
symbol for
  1. (in Britain, formerly) a film that may not be shown publicly to a child under fourteen
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
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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.