·noun A horizontal member spanning an opening, and carrying the superincumbent weight by means of its strength in resisting crosswise fracture.
1) Heb. mashkoph, a projecting cover (Ex. 12:22, 23; ver. 7, "upper door post," but R.V. "lintel"); ...
Easton's Bible Dictionary
the beam which forms the upper part of the framework of a door. ...
William Smith's Bible Dictionary