pneumatocyst
/ˈnjuːmətəsɪst/ /njuːˈmatə(ʊ)sɪst/ /njʊˈmatə(ʊ)sɪst/Chiefly Zoology and Botany
noun
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.
Origin
Mid 19th century; earliest use found in Thomas Huxley (1825–1895), biologist and science educationist. From pneumato- + cyst.
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