slow cooker
US /ˈsloʊ ˌkʊk.ər/
UK /ˈsloʊ ˌkʊk.ər/

1.
a large electric pot used for cooking food slowly over a long period
:
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I put all the ingredients for the stew into the slow cooker this morning.
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A slow cooker is perfect for busy weeknights.