man ‧ tel ‧ piece /ˈmæntlpiːs/ BrE AmE ( also man‧tel /ˈmæntl/ especially American English , man‧tel‧shelf /ˈmæntlʃelf/ British English ) noun [countable]
a wooden or stone shelf which is the top part of a frame surrounding a ↑ fireplace :
The clock on the mantelpiece struck 10.