American Heritage® Dictionary of the English Language, Fourth Edition
- n. A larva of certain trematodes that is produced within the sporocyst and that can give rise to additional rediae or to cercariae.
Century Dictionary and Cyclopedia
- n. The second larval stage of some fluke-worms or Trematoda, as Distoma, intervening between the condition of the ciliated embryo and the more advanced form known as cercaria. A redia is a sporocyst, containing the germs of other rediæ, which eventually develop into cercariæ. The redia of Distoma is also known as king's yellow worm. See
cercaria(with cut) and Distoma.
GNU Webster's 1913
- n. (Zoöl.) 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 rediæ, or else cercariæ within its own body. Called also
proscolex, and nurse. See Illustrationin Appendix.
- New Latin, after Francesco Redi (1626-1697), Italian naturalist. (American Heritage® Dictionary of the English Language, Fourth Edition)
“The period of development varies from ten to twenty weeks; each sporocyst may give rise to from five to eight _redia_ and each redia to from twelve to twenty _cercaria_.”
“The _daughter redia_ or _cercaria_, as they are now termed, leave the body of the snail and finally become encysted on the stems of grass, cresses and weeds.”
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