found: Work cat.: Eastern side of Agra Fort, showing Aurangzeb's barbican, India, 1965-2000, via University of Washington's digital collections, International Collections, May 14, 2020.
found: Barbican, via Ancient fortresses website, May 14, 2020(The barbican was an exterior castle defence situated at the entrance of the castle; The barbican or 'death trap' was developed as another way to strengthen the main entrance, by adding more defences in front of it - the barbican confined the enemy in a narrow passage - an easy target for castle inhabitants! The most common barbican design was a walled passage projecting from the front of the gatehouse) - http://www.ancientfortresses.org/barbican.htm
found: Merriam-Webster dictionary online, May 14, 2020(barbican: an outer defensive work, especially a tower at a gate or bridge)
found: Webster's new world college dictionary, ©2010, via Collins dictionary website, May 14, 2020(barbican: a defensive tower or similar fortification at a gate or bridge leading into a town or castle)
found: Art & architecture thesaurus online, May 14, 2020(barbicans. UF barbican; barbacans. SN Outworks in Medieval fortifications, such as gate towers, but more frequently an advance work used to flank the approach to a gateway)
found: Wikipedia, May 14, 2020:Barbican (A barbican (from Old French: barbacane) is a fortified outpost or gateway, such as an outer defense of a city or castle, or any tower situated over a gate or bridge which was used for defensive purposes. Barbicans were typically situated outside the main line of defenses and were connected to the city walls with a walled road called the neck. In the 15th century, with the improvement in siege tactics and artillery, barbicans lost their significance)