air vesicle

noun Botany.
a large, air-filled pocket, chiefly in plants that float on water, as kelps. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
air vesicle or air cavity
1.  a large air-filled intercellular space in some aquatic plants
2.  a large intercellular space in a leaf into which a stoma opens
air cavity or air cavity

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
air vesicle  
See float.
The American Heritage® Science Dictionary
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