• WordNet 3.6
    • n spirula a small tropical cephalopod of the genus Spirula having prominent eyes and short arms and a many-chambered shell coiled in a flat spiral
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Webster's Revised Unabridged Dictionary
    • n Spirula (Zoöl) 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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Century Dictionary and Cyclopedia
    • n spirula In Cephalopoda: A genus of sepioid cuttlefishes, typical of the family Spirulidaæ, having a delicate shell in the hinder part of the body rolled into a flat or discoidal spiral, with discrete whorls whose involute spire presents ventrally, and no guard. There are several species, as S. lævis and S. fragilis. The shells are common, and are sometimes carried by the Gulf Stream to the coast of England, but specimens of the entire animal are extremely rare. Also Spirulæa, Spirulea.
    • n spirula A member of this genus.
    • n spirula In sponges, an irregular spineless polyact spicule of spiral form.
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Chambers's Twentieth Century Dictionary
    • n Spirula spir′ū-la a genus of sepioid cuttle-fishes.
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Webster's Revised Unabridged Dictionary
NL., dim. of L. spira, a coil
Chambers's Twentieth Century Dictionary
L. spīra, a spire.


In literature:

In places in New Zealand, and elsewhere, large fossil deposits of Spirula peroni occur.
"Beautiful Shells of New Zealand" by E. G. B. Moss
Spirula 3 All the warmer seas.
"Sea-Weeds, Shells and Fossils" by Peter Gray