ple·ro·cer·coid 
(plîr′ō-sûrkoid′)
(plîr′ō-sûrkoid′)n.
The infective larval form of certain tapeworms, having a solid wormlike body and developing from the procercoid.
[Greek plērēs, full, infected; see pelə-1 in the Appendix of Indo-European roots + kerkos, tail + -OID.]