pneumatocyst

[ noo-mat-uh-sist, nyoo-, noo-muh-tuh-, nyoo ]
/ nʊˈmæt ə sɪst, nyʊ-, ˈnu mə tə-, ˈnyu /
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noun Biology.

the cavity of a pneumatophore.

Origin of pneumatocyst

First recorded in 1855–60; pneumato- + -cyst
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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