An archaic or dialectal spelling of 'cauldron,' a large metal pot used for cooking or heating liquids.
From Old French 'chaudron,' from Late Latin 'caldaria,' related to 'caldus' (warm). The spelling 'couldron' shows variant pronunciations and spellings in Middle English.
Medieval documents show cauldrons spelled at least 20 different ways—'couldron,' 'caldron,' 'chaudron'—because standardized spelling didn't exist yet!
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