The Collaborative International Dictionary of English v.0.48:

Proglottis \Pro*glot"tis\, n.; pl. Proglottides. [NL. fr. Gr.
   proglwtti`s the tip of the tongue; pro` forward + glw^tta the
   tongue.] (Zool)
   One of the free, or nearly free, segments of a tapeworm. It
   contains both male and female reproductive organs, and is
   capable of a brief independent existence.
   [1913 Webster]