Look up: Maar

1. maar
   [n] - a flat-bottomed volcanic crater that was formed by an explosion
   Found on http://www.webdictionary.co.uk/definitio
   
   
2. maar
   noun a flat-bottomed volcanic crater that was formed by an explosion; often filled with water
   Found on http://wordnetweb.princeton.edu/perl/web
   
   
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 resemble a sponge and are very ... [2 rela...
   Found on http://www.britannica.com/eb/a-z/m/1
   
   
4. 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 on http://volcano.oregonstate.edu/education
   
   
5. 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 Fran...
   Found on http://en.wikipedia.org/wiki/Maar