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Meaning of clitellum

cli•tel•lum

Pronunciation: (klī-tel'um), [key]
— pl. -tel•la
  1. a ring or saddle-shaped region of glandular tissue in the body wall of certain annelids, as earthworms and some leeches, that after copulation secretes a cocoon in which the eggs and sperm are deposited for fertilization and development.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.