- A class of flatworms characterized by lack of an alimentary canal and, in typical forms, by a segmented body with a scolex at one end; adult worms are vertebrate parasites, usually found in the small intestine.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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The class of tape-worms (Cestoidea) is one most numerous in its kinds, which are all completely parasitic in habit.