tandoor

tandoor, tandooriuuni A cylindrical clay oven used, in the cuisine of the Caucasus, Middle East, and Indian subcontinent, to make flat bread, or to cook meat.
2001, Martin Hughes, World Food: India (Lonely Planet), page 53

You can cook naan in a normal oven, but the results will inevitably disappoint; even Indians generally wait to savour them in restaurants, as very few homes are equipped with a tandoor.