Echinoderm (noun)

1. A marine invertebrate animal of the phylum Echinodermata, which includes starfish, sea urchins, and sea cucumbers.
2. A marine animal that belongs to the phylum Echinodermata and has a spiny skin and a five-part symmetry.

Origin:

Late 19th century: from echino- (from greek ekhinos "hedgehog") + -derm (from greek derma "skin").

Examples:

1. The tide pool was full of echinoderms, including starfish and sea urchins.
2. Echinoderms have a unique water vascular system that helps them move and feed.
3. The echinoderm is a fascinating creature that is found in all oceans.
4. The echinoderm is an important part of the ocean ecosystem.
5. Echinoderms have a five-part symmetry and can regenerate lost body parts.