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Webster 1913 Edition

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Noun.

[NL., dim. of L.

spira

a coil.]

(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.

See also: Spirula

spirula ‎(plural spirulas)

Any mollusk of the cephalopod genus Spirula, of which Spirula spirula is the only extant species.