unilocular

/ˌjuːnɪˈlɑːkjələr/
adjective
  1. Having a single chamber, cavity, or compartment.
    • The scientist described the fossil as unilocular, with a single internal cavity.
    • The unilocular cyst contained only one fluid-filled space.
    • In botany, a unilocular ovary has just one chamber where seeds develop.