a submarine that is propelled by nuclear power
"The nautilus silently glided through the deep ocean, its nuclear reactor powering the vessel for months without needing to surface."
cephalopod mollusk of warm seas whose females have delicate papery spiral shells
"The deep-sea submersible descended to observe a rare nautilus gliding gracefully near the volcanic vents, its intricate shell catching the faint light."
cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions
"The divers spotted a nautilus drifting near the coral reef, its spiral shell gleaming with pale pearly partitions in the sunlight."
A marine mollusc, of the family Nautilidae native to the Pacific Ocean and Indian Ocean, which has tentacles and a spiral shell with a series of air-filled chambers, of which Nautilus is the type genus.
"The deep-sea diver watched in awe as a nautilus drifted past its chambered spiral shell."