One of the mysteries of the English language finally explained.
Originally: the gas-filled chamber of a pneumatophore. Later more widely: any air-filled sac in an organism, especially in an animal body; (Medicine) a benign intraosseous cyst containing gas or air.
Mid 19th century; earliest use found in Thomas Huxley (1825–1895), biologist and science educationist. From pneumato- + cyst.
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