nucleoid

/ˈnukliˌɔɪd/
noun
  1. An irregularly shaped region within a prokaryotic cell that contains the genetic material (DNA), but is not enclosed by a membrane.
    • Scientists studied how proteins organize the DNA inside the nucleoid.
    • Unlike a nucleus, the nucleoid is not surrounded by a nuclear membrane.
    • In bacteria, the nucleoid holds the cell's single circular chromosome.