nautilus 
1. a submarine that is propelled by nuclear power • Syn: nuclear submarine, nuclear-powered submarine • Hypernyms: submarine, pigboat, sub, U-boat 2. cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions • Syn: chambered nautilus, pearly nautilus • Hypernyms: cephalopod, cephalopod mollusk • Member Holonyms: genus Nautilus 3. cephalopod mollusk of warm seas whose females have delicate papery spiral shells • Syn: paper nautilus, Argonaut, Argonauta argo • Hypernyms: octopod • Member Holonyms: Argonauta, genus Argonauta
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