• synonyms


noun Geology.
  1. a circular volcanic landform resulting from explosive ash eruptions.
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Origin of maar

First recorded in 1820–30, maar is from the German word Maar a depression filled with standing water (especially in the Eifel district)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for maar


noun plural maars or maare (ˈmɑːrə)
  1. (sometimes capital) a coneless volcanic crater that has been formed by a single explosion
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Word Origin for maar

C19: from German
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

maar in Science


  1. A broad, shallow, generally flat-floored volcanic crater that is often filled with water. Maars usually form from explosive eruptions caused by the heating and boiling of groundwater that is invaded by rising magma.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.