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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Spir·u·la n.  Zool. A genus of cephalopods having a multilocular, internal, siphunculated shell in the form of a flat spiral, the coils of which are not in contact.
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From: WordNet (r) 2.0

 spirula
      n : a small tropical cephalopod of the genus Spirula having
          prominent eyes and short arms and a many-chambered shell
          coiled in a flat spiral [syn: Spirula peronii]