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maar

[mahr] /mɑr/
noun, Geology
1.
a circular volcanic landform resulting from explosive ash eruptions.
Origin
1820-1830
1820-30; < German Maar a depression filled with standing water (especially in the Eifel district)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for maar

maar

/mɑː/
noun (pl) maars, maare (ˈmɑːrə)
1.
(sometimes capital) a coneless volcanic crater that has been formed by a single explosion
Word Origin
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
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maar in Science
maar
  (mär)   
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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