Any one of numerous species of cestode worms belonging to
   Taenia and many allied genera. The body is long, flat, and composed of
   numerous segments or proglottids varying in shape, those toward the end
   of the body being much larger and longer than the anterior ones, and
   containing the fully developed sexual organs. The head is small,
   destitute of a mouth, but furnished with two or more suckers (which
   vary greatly in shape in different genera), and sometimes, also, with
   hooks for adhesion to the walls of the intestines of the animals in
   which they are parasitic. The larvae (see Cysticercus) live in the
   flesh of various creatures, and when swallowed by another animal of the
   right species develop into the mature tapeworm in its intestine. See
   Illustration in Appendix.