Main Entry:

cal·de·ra

Pronunciation:

\kal-ˈder-ə, kȯl-, -ˈdir-\

Function:

noun

Etymology:

Spanish, literally, caldron, from Late Latin caldaria — more at cauldron

Date:

1691

: 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