Definition of pneumatocyst in English:

pneumatocyst

noun

Botany Zoology
  • 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.

Pronunciation

pneumatocyst

/njʊˈmatə(ʊ)sɪst//njuːˈmatə(ʊ)sɪst//ˈnjuːmətəsɪst/