horseshoe arch

(Also known as a Moorish arch or keyhole arch). An arch that forms more than a semicircle, typical of Western Islamic architecture. Web resource here.

House_of_Ya'far_-_Madinat_al-Zahra_(3)

Horseshoe arches. Madinat al-Zahra, Spain. 10th century. Photo: José Luiz Bernardes Ribeiro.