aerenchyma

[ai-reng-kuh-muh, ai-ren-]
noun Botany.
a tissue in certain aquatic plants, consisting of thin-walled cells and large intercellular spaces adapted for internal circulation of air.

Origin:
1895–1900; < Neo-Latin; see aer-, parenchyma

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Collins
World English Dictionary
aerenchyma (ɛəˈrɛŋkɪmə)
 
n
plant tissue with large air-filled spaces, which is typical of aquatic plants and allows air to reach waterlogged parts
 
[C19: from aer(o)- + Greek enkhuma infusion]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
aerenchyma   (â-rěng'kə-mə)  Pronunciation Key 
A spongy tissue with large air spaces found between the cells of the stems and leaves of aquatic plants. Aerenchyma provides buoyancy and allows the circulation of gases.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Stems submerged under water develop aerenchyma tissue characteristic of aquatic plants.
They are positioned above a prominent keel of spongy aerenchyma tissue which aids in keeping the large leaves afloat.
Ethylene effects on root growth and aerenchyma formation were similar to those observed for hypoxia treatment.
Diffusion through the plant's aerenchyma can supply atmospheric air to a depth of four meters.
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