any cephalopod of the genus Spirula, having a flat, spiral shell that is partly inside and partly outside the posterior part of the body.
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How to use spirula in a sentence
Among the tufts of grass on the sloping sides of this mound were great numbers of spirula-shells in a tolerably perfect condition.Cruise of the 'Alert' | R. W. Coppinger
In places in New Zealand, and elsewhere, large fossil deposits of spirula peroni occur.Beautiful Shells of New Zealand | E. G. B. Moss
After a gale, on looking amongst the wrack cast up by the highest waves, large numbers of our spirula will be found.Beautiful Shells of New Zealand | E. G. B. Moss
The latter is partly straight and partly convoluted, nearly as in spirula.A Manual of Elementary Geology | Charles Lyell.
A series of Chambers joining each other, as in Nautilus, spirula, &c.A Conchological Manual | George Brettingham Sowerby
British Dictionary definitions for spirula
a tropical cephalopod mollusc, Spirula peronii, having prominent eyes, short arms, and a small flattened spirally coiled internal shell: order Decapoda (cuttlefish and squids)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012