plural noun
Nau·​til·​i·​dae | \-ˌdē\

Definition of Nautilidae 

: a family of cephalopod mollusks that comprises nautiloids with closely coiled shells and includes all recent members of the order Nautiloidea — see nautilus sense 1 b

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History and Etymology for Nautilidae

New Latin, from Nautilus, type genus + -idae

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