from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A hollow cell in the excretory system of certain invertebrates, including flatworms and rotifers, containing a tuft of rapidly beating cilia that serve to propel waste products into excretory tubules.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun organ of excretion in flatworms


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