- Many-chambered; -- applied to shells of Foraminifera and cephalopods. See Illust. of nautilus.
- In entomology, having several or numerous chambers: applied to the nests of bugs, and galls, once they contain numerous cells or compartments, each destined for or inhabited by a single larva.
- In conchology, having many compartments; multilocular.
- Definition for "polythalamous"
- Synonym for "polythalamous"
- Variant for "polythalamous"