Webster's English Dictionary

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nautilus

nau.ti.lus \'no.t-*l-*s, 'na:t-\ \-*l-.i-, -.e-\ n or nau.ti.lus.es or 
   nau.ti.li [NL, genus name, fr. L, paper nautilus, fr. Gk nautilos, lit., 
   sailor, fr] pl . naus ship 1: any of a genus (Nautilus) of cephalopod 
   mollusks of the So. Pacifi c and Indian oceans having a spiral chambered 
   shell pearly on the inside 2: a cephalopod (genus Argonauta) whose female 
   has a delicate papery  shell