[spir-yuh-luh, -oo-luh]
noun, plural spirulae [spir-yuh-lee, -oo-lee] .
any cephalopod of the genus Spirula, having a flat, spiral shell that is partly inside and partly outside the posterior part of the body.

1825–35; < Neo-Latin; Late Latin spīrula twisted cake. See spira, -ule

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World English Dictionary
spirula (ˈspaɪrʊlə)
a tropical cephalopod mollusc, Spirula peronii, having prominent eyes, short arms, and a small flattened spirally coiled internal shell: order Decapoda (cuttlefish and squids)
[C19: via New Latin from Late Latin: a small twisted cake, from Latin spīra a coil]

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