Cestoidea \Ces*toid"e*a\ (s[e^]s*toid"[-e]*[.a]), n. pl. [NL.,
   gr. Gr. kesto`s girdle + -oid.] (Zool.)
   A class of parasitic worms of the phylum Platyhelminthes
   (formerly 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. [Written also Cestoidea.]

   Syn: class Cestoidea, Cestoidea.
        [1913 Webster]