One of the mysteries of the English language finally explained.
With plural or singular concord. A subclass of cephalopod molluscs possessing a many-chambered shell (either straight or coiled), of which the genus Nautilus is the only living member; (in some classifications) one of a number of subdivisions of the tetrabranchiate cephalopods.
Late 19th century; earliest use found in Johnson's New Universal Cyclopedia. From scientific Latin Nautiloidea (attributed to L. Agassiz, 1847) from Nautilus + -oidea.
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