caldera
cal·de·ra
noun \kal-ˈder-ə, kȯl-, -ˈdir-\Definition of CALDERA
: a volcanic crater that has a diameter many times that of the vent and is formed by collapse of the central part of a volcano or by explosions of extraordinary violence
Origin of CALDERA
Spanish, literally, caldron, from Late Latin caldaria — more at cauldron
First Known Use: 1691
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