1. an extinct marine mollusk with a coiled shell, related to modern squid and octopuses
Usage: paleontology

1. relating to or resembling ammonoids
Usage: paleontology

Examples

• The ammonoid fossils found in the limestone date back to the Jurassic period.
• Scientists study ammonoid shells to understand ancient ocean conditions.
• The museum’s collection includes several well-preserved ammonoid specimens.
• Ammonoid creatures dominated the seas for over 300 million years.
• The ammonoid shell showed intricate suture patterns along its chambers.
• Researchers identified the ammonoid species based on its distinctive coiling pattern.