lintel

A horizontal structural member, such as a beam or stone, that spans an opening, as between the uprights of a door or window or between two columns or piers.

In architecture, a horizontal piece of timber or stone resting on the jambs of a door or window, or spanning any other open space in a wall or in a columnar construction, and serving to support superincumbent weight.

See lingel.

A horizontal member spanning an opening, and carrying the superincumbent weight by means of its strength in resisting crosswise fracture.

A horizontal structural beam spanning an opening, such as between the uprights of a door or a window, and which supports the wall above.