maar

maar

[mahr]
noun Geology.
a circular volcanic landform resulting from explosive ash eruptions.

Origin:
1820–30; < German Maar a depression filled with standing water (especially in the Eifel district)

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World English Dictionary
maar (mɑː)
 
n , pl maars, maare
(sometimes capital) a coneless volcanic crater that has been formed by a single explosion
 
[C19: from German]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
maar   (mär)  Pronunciation Key 
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
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