Paper-nautilus definition

Any of several cephalopod mollusks of the genus Argonauta that have eight arms, the female of which is much larger than the male and inhabits a paper-thin shell that serves as an egg case.
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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.
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This shell.
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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.
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Other Word Forms

Noun

Singular:
paper-nautilus
Plural:
paper nautiluses, paper nautili