One of the mysteries of the English language finally explained.
1Entomology. Of a plant gall: having only one chamber. rare.
2Zoology. Of an animal or protist: having a shell, test, or skeleton with a single chamber.
Early 19th century; earliest use found in William Kirby (1759–1850), entomologist and naturalist. From mono- + scientific Latin thalamus or its etymon ancient Greek θάλαμος inner chamber + -ous. In sense 2 after French monothalame.
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