​GROS VENTRES (Fr. for “Great Bellies”), or Atsina, a tribe of North American Indians of Algonquian stock. The name is said to have reference to the greediness of the people, but more probably originated from their prominent tattooing. They are settled at Fort Belknap agency, Montana. The name has also been given to other tribes, e.g. the Hidatsa or Minitari, now at Fort Berthold, North Dakota.