\Re"di*a\ (r?"d?*?), n.; pl. L. {Redi[ae]} (-[=e]), E.
{Redias} (-?z). [NL.; of uncertain origin.] (Zo["o]l.)
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
redi[ae], or else cercari[ae] within its own body. Called
also {proscolex}, and {nurse}. See Illustration in Appendix.