nematocysts
/nɪˈmætəˌsɪsts/
noun
- Tiny, stinging structures found in the cells of animals like jellyfish, sea anemones, and corals, used to capture prey or defend against threats.
- Some sea slugs eat jellyfish and store the nematocysts in their own bodies for protection.
- When a jellyfish brushes against your skin, its nematocysts release venom that causes a painful sting.
- Under a microscope, the coiled nematocysts of a sea anemone look like tiny harpoons ready to fire.