nautiloid
noun
nau·ti·loid
ˈnȯ-tə-ˌlȯid
ˈnä-
: any of a subclass (Nautiloidea) of cephalopods bearing an external straight, curved, or spiral shell that were abundant chiefly in the Paleozoic but are represented in the recent fauna only by the nautiluses
nautiloid
adjective
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Merriam-Webster unabridged
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