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Meaning of pygidium

py•gid•i•um

Pronunciation: (pī-jid'ē-um), [key]
— pl. -gid•i•a
  1. any of various structures or regions at the caudal end of the body in certain invertebrates.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.