From The Collaborative International Dictionary of English v.0.48:

Redia \Re"di*a\ (r?"d?*?), n.; pl. L. Rediae (-[=e]), E.
   Redias (-?z). [NL.; of uncertain origin.] (Zool.)
   A kind of larva, or nurse, which is prroduced within the
   sporocyst of certain trematodes by asexual generation. It in
   turn produces, in the same way, either another generation of
   rediae, or else cercariae within its own body. Called also
   proscolex, and nurse. See Illustration in Appendix.
   [1913 Webster]
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