Etymology
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caldera (n.)

"cavity on the summit of a volcano," 1865, from Spanish caldera, literally "cauldron, kettle," from Latin caldarium "hot-bath" (plural caldaria), from caldarius "pertaining to warming," from calidus "warm, hot" (from PIE root *kele- (1) "warm"). A doublet of cauldron.

The term was originally used in describing volcanic regions occurring where Spanish is the current language, and was introduced by Von Buch in his description of the Canaries. [Century Dictionary]

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Definitions of caldera

caldera (n.)
a large crater caused by the violent explosion of a volcano that collapses into a depression;
From wordnet.princeton.edu