noun
- a marine animal with a spiny skin and a body that has five equal parts arranged around a central point
Usage: biology
Examples
- Starfish are the most familiar type of echinoderm.
- Sea urchins are echinoderms with sharp spines covering their bodies.
- The echinoderm’s unique five-part body structure makes it easy to identify.
- Sand dollars are flat echinoderms commonly found on beaches.
- Marine biologists study echinoderms to understand ocean ecosystems.
- The echinoderm slowly moved across the ocean floor using its tube feet.