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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]