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A longitudinal fold of the intestinal wall in certain invertebrates that increases the absorptive and digestive surface area of the intestine.
[Greek tuphlos, blind + Greek sōlēn, pipe.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(in certain animals such as molluscs, annelids, and ascidians) a fold in the intestine or inner wall of the intestine
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014