nautilus
Concise Oxford English Dictionary © 2008 Oxford University Press:
nautilus /ˈnɔːtɪləs/
▶noun (pl. nautiluses or nautili /-lʌɪ, -liː/) a cephalopod mollusc with a light external spiral shell and numerous short tentacles around the mouth. [Genus Nautilus: several species.]
– derivatives
nautiloid noun.
nautiloid noun.
– origin mod. L., from L., from Gk nautilos, lit. ‘sailor’.
'nautilus' also found in these Oxford entries:

