man.tel.tree

n.（名詞）
A beam, a stone, or an arch that functions as a lintel on a fireplace, supporting the masonry above.
壁爐過梁：壁爐上方起過梁作用的一根橫梁，一塊石頭或一個拱形物，用來支撐上方的磚石建筑

來源：
Middle English mantiltre
中古英語 mantiltre
mantle [mantle] * see mantle
mantle [斗篷] *參見 mantle
tre [beam] * see tree
tre [橫梁] *參見 tree