One of the mysteries of the English language finally explained.
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.
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.
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