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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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
typhlosolea dorsal unfolding of the earthworm's intestine, along its whole length, that increases its surface area for digestive purposes.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005