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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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]