polythalamous

from The Century Dictionary.

• In entomology, having several or many chambers: applied to the nests of insects, and to galls, when they contain many cells or compartments, each destined for or inhabited by a single larva.
• In conchology, having many compartments; multilocular.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Zoöl.) Many-chambered; -- applied to shells of Foraminifera and cephalopods. See Illust. of nautilus.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective zoology Having many chambers.