Definition of Cestoidea
1. n. pl. A class of parasitic worms (Platelminthes) of which the tapeworms are the most common examples. The body is flattened, and usually but not always long, and composed of numerous joints or segments, each of which may contain a complete set of male and female reproductive organs. They have neither mouth nor intestine. See Tapeworm.
Medical Definition of Cestoidea
1. The tapeworms, a class of platyhelminth flatworms characterised by lack of an alimentary canal and, in typical forms (subclass Cestoda), by a segmented body with a scolex or holdfast organ at one end; adult worms are vertebrate parasites, usually found in the small intestine. Origin: G. Kestos, girdle, + eidos, form (05 Mar 2000)
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