- any of a genus (Argonauta) of small, squidlike octopods: the female secretes a large, frail, paperlike shell to protect her eggs until they hatch; argonaut
- this shell
paper nautiluspaper nautilus
(plural paper nautiluses or paper nautili)
- A pelagic octopus of genus Argonauta, found in warm seas, whose females produce a paper-thin egg case resembling a shell into which she deposits her eggs.