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

French door archway back door barway bulkhead carriage entrance cellar door cellarway door doorjamb doorpost doorway front door gate gatepost gateway hatch hatchway porch portal porte cochere postern propylaeum pylon scuttle side door stile storm door threshold tollgate trap trap door turnpike turnstile