nautilus

noun

1. a submarine that is propelled by nuclear power

Definition categories: man–made, pigboat, sub, submarine

2. cephalopod mollusk of warm seas whose females have delicate papery spiral shells

Similar word(s): argonaut

Definition categories: animal, octopod

3. cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions

Definition categories: animal, cephalopod