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pneumatocyst

[noo-mat-uh-sist, nyoo-, noo-muh-tuh-, nyoo] /nʊˈmæt ə sɪst, nyʊ-, ˈnu mə tə-, ˈnyu/
noun, Biology
1.
the cavity of a pneumatophore.
Origin of pneumatocyst
1855-1860
1855-60; pneumato- + -cyst
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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