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Definition of nautilus noun from the Oxford Advanced American Dictionary

 

nautilus

 noun
noun
NAmE//ˈnɔt̮l̩əs//
 
(pl. nautiluses, nautili
NAmE//ˈnɔt̮l̩aɪ//
 
)
 
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a creature with a shell that lives in the ocean. It has tentacles around its mouth and its shell fills with gas to help it float.
See nautilus in the Oxford Advanced Learner's Dictionary
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