\Ces*toid"e*a\ (s[e^]s*toid"[-e]*[.a]), n. pl. [NL.,
gr. Gr. kesto`s girdle + -oid.] (Zo["o]l.)
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}. [Written
also {Cestoda}.]