1. an extinct marine mollusk with a coiled or straight shell, related to modern nautiluses
Usage: paleontology

1. resembling or relating to a nautilus or nautiloid
Usage: paleontology

Examples

• The museum displayed fossilized nautiloid shells from the Paleozoic era.
• Scientists study nautiloid fossils to understand ancient marine ecosystems.
• The nautiloid specimen showed clear chamber divisions in its shell.
• Nautiloid creatures dominated the oceans millions of years ago.
• The nautiloid shape of the fossil indicated it was a cephalopod.
• Researchers found nautiloid remains in the limestone formation.