[noo-mat-uh-sist, nyoo-, noo-muh-tuh-, nyoo]
noun Biology.
the cavity of a pneumatophore.

1855–60; pneumato- + -cyst Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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In contrast, a bull kelp plant has only one pneumatocyst that supports several blades near the water's surface.
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