A large crater-like depression, typically formed by volcanic activity or erosion. Also a Spanish surname, most famously associated with the playwright Pedro Calderón de la Barca.
From Spanish 'calderón,' augmentative of 'caldera' meaning 'cauldron, kettle,' from Latin 'caldaria' (relating to warming). The geological term developed from the resemblance of these formations to giant cauldrons.
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