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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Ar·chi·an·nel·i·da n. pl.  Zool. A group of Annelida remarkable for having no external segments or distinct ventral nerve ganglions.
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From: WordNet (r) 2.0

 Archiannelida
      n : a class of Annelida [syn: class Archiannelida]