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stone canal

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stone canal

–noun
(in certain echinoderms) a tube lined with calcareous deposits, connecting the madreporite with a circular canal around the mouth.

Origin:
1885–90
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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stone canal  
n.  A calcareous duct in echinoderms that leads from the madreporite to a ring-shaped canal around the mouth.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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