Either of the upright posts on either side of a door, which together support a lintel.

A device on or adjacent to an outer door for announcing one's presence. It can be mechanical, directly sounding a bell, or a button that electrically sounds a chime or buzzer inside the building.

(intransitive) To ring many doorbells in an effort to contact people and thereby spread information or solicit.

The person in charge of an entryway, sometimes just a doorman, sometimes something more.

A circular device attached to a door, the rotation of which permits the unlatching of the door. / (informal, derogatory) A stupid person.

plural of back door

A fireproof door designed to stop fires spreading through buildings. / The door of a furnace offering access to the fire inside.

plural of pocket door

plural of Dutch door

(informal, physics) The result of the second law of thermodynamics in which the entropy of the universe steadily increases until thermal equilibrium is reached, energy is uniformly dispersed, and no life exists.