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Definition of Echinoidea
1. Noun. Sea urchins and sand dollars.
Exact synonyms: Class Echinoidea
Group relationships: Echinodermata, Phylum Echinodermata
Member holonyms: Sea Urchin, Exocycloida, Order Exocycloida, Order Spatangoida, Spatangoida
Generic synonyms: Class
Group relationships: Echinodermata, Phylum Echinodermata
Member holonyms: Sea Urchin, Exocycloida, Order Exocycloida, Order Spatangoida, Spatangoida
Generic synonyms: Class
Definition of Echinoidea
1. n. pl. The class Echinodermata which includes the sea urchins. They have a calcareous shell, usually more or less spheroidal or disk-shaped, composed of many united plates, and covered with movable spines. See Spatangoid, Clypeastroid.
Medical Definition of Echinoidea
1.
Lexicographical Neighbors of Echinoidea
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