A nut with a built in washer like flange. Tee. A nut designed to be driven into wood to create a threaded hole. Square. A four sided nut. Prevailing torque lock. A non-reversible lock nut used for high temperature applications. K-Lock or Kep. A nut with an attached free-spinning external tooth lockwasher.
adjective. The definition of metropolitan is a city or something related to a city. A city and the immediate locations surrounding it is an example of a metropolitan area.
A metropolis is usually a significant economical, political and cultural center for some country or region, and an important hub for regional or international connections and communications. The plural of the word is most commonly metropolises, though metropoleis is sometimes used as well.