cauldron -
A large bowl-shaped pot used for boiling over an open flame.
Wikipedia
A cauldron or caldron (from earlier cauderon, from Anglo-French, from Latin caldārium hot bath, from calidus warm) is a large metal pot for cooking and/or boiling over an open fire, with a large mouth and frequently with an arc-shaped hanger.
OmegaWiki Dictionary
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cauldron A very large pot that is used for boiling.