Gyros, sometimes anglicized as a gyro (ˈjɪəroʊ,_ˈdʒɪər-,_ˈdʒaɪr-; yíros/gyros, ˈʝiros) in some regions, is meat cooked on a vertical rotisserie, then sliced and served wrapped or stuffed in pita bread, along with other ingredients such as tomato, onion, fried potatoes, and tzatziki. In Greece, it is normally made with pork or sometimes with chicken, whilst beef and lamb are also used in other countries.
Grilling a vertical spit of stacked meat and slicing it off as it cooks was developed in Bursa in the 19th century in the Ottoman Empire, and called doner kebab (döner kebap). Following World War II, doner kebab made with lamb was present in Athens, introduced by immigrants from Anatolia and the Middle East, possibly with the population exchange between Greece and Turkey. The Greek version is normally made with pork and served with tzatziki, and became known as gyros.
By 1970, gyros wraps were already a popular fast food in Athens, as well as in Chicago and New York City. At that time, although vertical rotisseries were starting to be mass-produced in the US by Gyros Inc. of Chicago, the stacks of meat were still hand-made. There are several claimants to have introduced the first mass-produced gyros to the United States, all based in the Chicago area in the early 1970s, and of Greek descent. One of them, Peter Parthenis, states that the mass-produced gyro was first conceptualized by John and Margaret Garlic; John Garlic was a Jewish car salesman who later ran a restaurant featuring live dolphins.
The name comes from the Greek γύρος (gyros, 'circle' or 'turn'), and is a calque of the Turkish word döner, from dönmek, also meaning "turn". It was originally called ντονέρ (doˈner) in Greece. The word ντονέρ was criticized in mid-1970s Greece for being Turkish. The word gyro or gyros was already in use in American English by at least 1970, and along with γύρος in Greek, eventually came to replace doner kebab for the Greek version of the dish. Some Greek restaurants in the US continued to use both doner kebab and gyros to refer to the same dish, in the 1970s.