A door is a hard, flat object a person can open and close so that person can go into a room or other place. It is found in houses and other buildings. Doors are also found in cars and cages.
The reasons for a door are:
Door
Etymology
The word Tür, Old High German turi, Middle High German tür(e), has been documented since the 8th century. Originally it occurred only in the dual, later in the plural, and was reinterpreted in German into a new singular. Like Old Icelandic dyrr (plural) and Old English duru (plural), it goes back to Urgermanic dur-, which in turn is an ablaut of Indo-European dhwer- (cf. Greek thýra, Latin forēs).
History
The first dwellings built by humans of wickerwork, wooden posts, mud, or stone usually had no lockable entrance doors; for protection against the intrusion of domestic animals or predators, the presence of a movable wickerwork lattice of twigs in the lower half is probable. Door closures, like window openings, appear later. Interior doors were equally non-existent. Ancient and medieval doors usually had lateral pivots anchored in matching cavities in the sill and lintel.
During the rescue excavations at the Zurich Opera House in 2010, the most important single find was an approximately 5000-year-old wooden door, which could go down in history as the third oldest door in Switzerland and probably in Europe. The Zurich door is similar to the second oldest example found in Pfäffikon ZH. It is much better preserved and consists of three boards held together by sophisticated connectors. The door hinge is also preserved.