chafing dish
US /ˈtʃeɪ.fɪŋ ˌdɪʃ/
UK /ˈtʃeɪ.fɪŋ ˌdɪʃ/

1.
a metal dish with a heating unit underneath, used for keeping food warm
:
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The buffet featured several chafing dishes keeping the main courses hot.
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She bought a new chafing dish for her catering business.