from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The infective larva of some tapeworms, characterized by its solid elongated body.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The last larval form found in the second intermediate host of many Cestoda with aquatic life cycles.

from The Century Dictionary and Cyclopedia

  • n. The solid elongate larva, with no bladder, of some cestodes, as Bothriocephalus latus, an intestinal parasite found in man and the dog. Compare plerocestoid.


Greek plērēs, full, infected; see pelə-1 in Indo-European roots + kerkos, tail + -oid.
(American Heritage® Dictionary of the English Language, Fourth Edition)


  • The plerocercoid develops into an adult tapeworm when the fish is ingested by a suitable warm-blooded host.


  • When the copepod is eaten by a fish the procercoid migrates to striated muscle of the fish where it transforms into the plerocercoid stage.


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