A vaulted area open at one end. Iwans often open onto a courtyard.

A rectangular, usually vaulted room, one of whose sides is entirely open to a forecourt or another hall. This type of structure was adopted by oriental Islam from Parthian or Sassanian architectural sources and is not linked to any particular function. It is found both in secular and sacred buildings.

a large, vaulted chamber with a monumental arched opening on one side

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