1. 
   maar
   [n] - a flat-bottomed volcanic crater that was formed by an explosion
   Found op http://www.webdictionary.co.uk/definition.php?query=maar
   
   
2. 
   maar
   noun a flat-bottomed volcanic crater that was formed by an explosion; often filled with water
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=maar
   
   
3. 
   maar
   (from the article `lake`) ...of the roofs of underground magma (molten silica) chambers and those caused by explosion of new volcanic sources and that are built of nonvolcanic ... ...cones, but they are made up of volcanic glass fragments so riddled with gas-bubble holes (vesicles) that they resembl...
   Found op http://www.britannica.com/eb/a-z/m/1
   
   
4. 
   Maar
   A maar is a broad, low-relief volcanic crater that is caused by a phreatomagmatic eruption, an explosion caused by groundwater coming into contact with hot lava or magma. A maar characteristically fills with water to form a relatively shallow crater lake. The name comes from the local Moselle Franc...
   Found op http://en.wikipedia.org/wiki/Maar
   
   
5. 
   maar
   Aerial view toward north of Ukinrek Maars, Alaska; Lake Becharof at top of photo. Water partially fills the eastern maar and completely covers a lava dome that was erupted in the 100-m deep crater during a 10-day eruption in 1977. Maar is about 300 m in diameter. Credit: C. Nye / Alaska Division of ...
   Found op http://www.daviddarling.info/encyclopedia/M/maar.html
   
   
6. 
   Maar
   A volcanic crater that is produced by an explosion in an area of low relief, is generally more or less circular, and often contains a lake, pond, or marsh.
   Found op http://volcano.oregonstate.edu/education/glossary.html
   
   
7. 
   maar
   1) Crater 2) Volcanic crater 3) Volcano crater
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/maar/1
   
   

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