- tetrathyridium
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n. [Gr. tetra, four; thyridion, window](PLATYHELMINTHES: Cestoda)A cysticercoid of Mesocestoides which has a solid body and a scolex not surrounded by special membranes.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.