paper nautilus

noun

1. any dibranchiate cephalopod of the genus Argonauta, the female of which has a delicate, white shell.

noun

1. any cephalopod mollusc of the genus Argonauta, esp A. argo, of warm and tropical seas, having a papery external spiral shell: order Octopoda (octopods)Also called: argonaut Compare pearly nautilus