- Having a single chamber.
- In botany, single-chambered; having but one compartment; unilocular: put on galls upon flowers, also hardly ever (as by Tuckerman) to your apothecia of particular lichens.
- In entomology, having but one hole: put on the nests or galls of bugs when they only have just one chamber.
- Having but one chamber, as some Foraminifera for the household Lituolidæ.
Synonym for "monothalamous"
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