manteltree

manteltree or man·tle·tree [man-tl-tree] Word Origin noun

1. a wooden or stone lintel over the opening of a fireplace.
2. a masonry arch used in place of such a lintel.

Origin of manteltree late Middle English word dating back to 1425–75; see origin at mantel, tree British Dictionary definitions for manteltree manteltree mantletree noun

1. a beam made of stone or wood that forms the lintel over a fireplace