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aerial root

aerial root in Science
aerial root
  (âr'ē-əl)   
A root that develops from a location on a plant above the surface of the earth or water, as from a stem. For example, some orchids have aerial roots that grow from their stems and absorb water directly from the air.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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