manteltree or man·tle·tree [man-tl-tree] Word Origin noun
- a wooden or stone lintel over the opening of a fireplace.
- 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, British Dictionary definitions for manteltree manteltree mantletree noun
- a beam made of stone or wood that forms the lintel over a fireplace