Definition of nautiloid
: 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
Recent Examples of nautiloid from the Web
Perhaps the smaller mosasaur caught the nautiloid, but was forced to give up its prey when a larger mosasaur approached.
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