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caldera

cal·de·ra [ kal dérrə ] (plural cal·de·ras)


noun 
Definition:
 
large crater at top of volcano: a large crater in a volcano, caused by a major eruption followed by the collapse of the volcanic pipe walls that form the volcano's cone. It may later contain a lake.

[Late 17th century. Via Spanish< late Latin caldaria "cooking pot" < Latin caldus "warm"]
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