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aer·en·chy·ma | \ ˌer-ˈeŋ-kə-mə 
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\Definition of aerenchyma
: modified parenchymatous tissue having large intracellular air spaces that is found especially in aquatic plants where it facilitates gaseous exchange and maintains buoyancy
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Time Traveler for aerenchyma
The first known use of aerenchyma was circa 1893
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