Spirula
Pronunciation : Spir"u*la
Part of Speech : n.
Etymology : [NL., dim. of L. spira a coil.] (Zo?l.)
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913