"nautilus" in the noun sense
1. nautilus, nuclear submarine, nuclear-powered submarine
a submarine that is propelled by nuclear power
2. paper nautilus, nautilus, Argonaut, Argonauta argo
cephalopod mollusk of warm seas whose females have delicate papery spiral shells
3. chambered nautilus, pearly nautilus, nautilus
cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions
Source: WordNet® (An amazing lexical database of English)
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