[kal-der-uh, kawl-]
a large, basinlike depression resulting from the explosion or collapse of the center of a volcano.

1860–65; < Spanish Caldera, name of a crater on Canary Islands, literally, cauldron < Late Latin caldāria, noun use of feminine of caldārius of warming; see caldarium

caldera, fumarole, geyser, volcano. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
caldera (kælˈdɛərə, ˈkɔːldərə)
See cirque a large basin-shaped crater at the top of a volcano, formed by the collapse or explosion of the cone
[C19: from Spanish Caldera (literally: cauldron), name of a crater in the Canary Islands]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1865, "cavity on the summit of a volcano," from Sp. caldera "cauldron, kettle," from L. caldarium, caldarius "pertaining to warming," from calidus "warm, hot" (see calorie).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
caldera   (kāl-dâr'ə, -dîr'ə, käl-)  Pronunciation Key 
A large, roughly circular crater left after a volcanic explosion or the collapse of a volcanic cone. Calderas are typically much wider in diameter than the openings of the vents from which they were formed.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The harbor is part of the crater, or caldera, that was formed as a result of the eruption.
In good weather it is a radiant dark blue, and the forms and colors of the caldera walls are reflected in perfect clarity.
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