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from the GNU version of the Collaborative International Dictionary of English

  • A group of Annelida remarkable for having no external segments or distinct ventral nerve ganglions.

from The Century Dictionary and Cyclopedia

  • A subclass or other leading division of annelids, supposed to be the nearest living representatives of the archetypal segmented worms. The best-known genus is Polygordius (which see).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a class of Annelida


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