belemnite
/ˈbɛləmˌnaɪt/
noun
- An extinct marine animal from the time of dinosaurs, with a long, pointed, bullet-shaped internal shell; often found as a fossil.
- The museum displayed a collection of belemnites from the Jurassic period.
- The hiker found a belemnite fossil while walking along the beach.
- Belemnites are sometimes called 'thunderstones' in folklore.