A large unit of measurement used in England, especially for coal or grain, typically equal to about 36 bushels.
From Middle English, possibly derived from Old French 'chaudron' (caldron or cauldron), the measurement named after a large container's capacity.
The chaldron was specifically important in the coal trade—medieval England used this measurement for coal so much that you can track the growth of coal mining by finding how often 'chaldrons' appear in historical records.
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