unilocular

Divided into or containing a single cavity or compartment.

In botany, zoology, and pathology, having but one loculus, cavity, or compartment; single-chambered; monothalamous, as a foraminifer; uniloculate: as, a unilocular pericarp or anther; a unilocular heart or shell: correlated with bilocular, trilocular, quadrilocular, and multilocular or plurilocular. Also monolocular.

Having one cell or cavity only.

Having a single loculus or compartment.