At·si·na (āt-sē'nə) n.
pl.Atsina or At·si·nas In all senses also called Gros Ventre.
A Native American people formerly inhabiting the plains of northern Montana and southern Saskatchewan, with a present-day population in north central Montana.
A member of this people.
The Algonquian language of the Atsina, dialectally related to Arapaho.
Gros Ventre (grō' vänt') n.
pl.Gros Ventre or Gros Ventres (vänt')