Definition of polythalamous in US English:

polythalamous

adjective

  • 1Entomology. Of a plant gall: having more than one chamber.

  • 2Zoology. Of or designating an animal having a shell, test, or skeleton with more than one chamber.

Origin

Early 19th century; earliest use found in William Kirby (1759–1850), entomologist and naturalist. From poly- + scientific Latin thalamus or its etymon ancient Greek θάλαμος inner chamber + -ous.

Pronunciation

polythalamous

/ˌpɒlɪˈθaləməs/