noun, plural spirulae
[spir-yuh-lee, -oo-lee] /ˈspɪr yəˌli, -ʊˌli/ (Show IPA)
any cephalopod of the genus Spirula, having a flat, spiral shell that is partly inside and partly outside the posterior part of the body.
a tropical cephalopod mollusc, Spirula peronii, having prominent eyes, short arms, and a small flattened spirally coiled internal shell: order Decapoda (cuttlefish and squids)


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