noun
- marine animals with spiny skin and radial symmetry, including starfish, sea urchins, and sea cucumbers
Usage: biology
Examples
- Echinoderms are found in oceans around the world.
- The starfish is one of the most recognizable echinoderms.
- Sea urchins and sand dollars are common echinoderms on the beach.
- Echinoderms have a unique water vascular system for movement.
- The biology class studied various echinoderms during their marine unit.
- Most echinoderms can regenerate lost body parts.