chimney pot
US /ˈtʃɪm.ni ˌpɑːt/
UK /ˈtʃɪm.ni ˌpɑːt/
1.
a short pipe of earthenware or metal, typically inverted, fixed on the top of a chimney to increase the draft and prevent smoke from blowing down
:
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The old house had several decorative chimney pots on its roof.
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A strong wind blew off one of the chimney pots.