Definition of pearly nautilus in US English:

pearly nautilus

noun

  • another term for "chambered nautilus" (see nautilus)
    • ‘From that area they discovered incredibly rich marine life, ammonites, giant coiled things looking like the pearly nautilus and related to it but now long extinct at the same time as the dinosaurs.’
    • ‘Meanwhile, only a few species of pearly nautilus continue as the last survivors of the once important Nautiloidea.’
    • ‘The Nautilids include the modern pearly nautilus and its evolutionary ancestors and relatives.’
    • ‘The pearly nautilus is an exception to most generalizations about cephalopods.’