noun
sea urchins and sand dollars
• Syn: ↑class Echinoidea
• Hypernyms: ↑class
• Member Holonyms: ↑Echinodermata, ↑phylum Echinodermata
• Member Meronyms: ↑sea urchin, ↑Exocycloida, ↑order Exocycloida, ↑Spatangoida, ↑order Spatangoida
Useful english dictionary. 2012.