caldera

UK: /kælˈdɛərə/, /ˈkɔːldərə/ US: (kal der′ə, kôl-)

WordReference Random House Unabridged Dictionary of American English © 2025

cal•de•ra  (kal der′ə, kôl-), n. 

1. Geology a large, basinlike depression resulting from the explosion or collapse of the center of a volcano.

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

Collins Concise English Dictionary © HarperCollins Publishers::

caldera / kælˈdɛərə ˈkɔːldərə/ noun

1. a large basin-shaped crater at the top of a volcano, formed by the collapse or explosion of the cone
   See cirque

Etymology: 19th Century: from Spanish Caldera (literally: cauldron), name of a crater in the Canary Islands