manteltree

man.tel.tree

n.（名词）
A beam, a stone, or an arch that functions as a lintel on a fireplace, supporting the masonry above.
壁炉过梁：壁炉上方起过梁作用的一根横梁，一块石头或一个拱形物，用来支撑上方的砖石建筑

来源：
Middle English mantiltre
中古英语 mantiltre
mantle [mantle] * see mantle
mantle [斗篷] *参见 mantle
tre [beam] * see tree
tre [横梁] *参见 tree