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WORDNET DICTIONARY
CIDE DICTIONARY
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WORDNET DICTIONARY
Noun echinoidea has 1 sense
- echinoidea(n = noun.animal) class echinoidea - sea urchins and sand dollars; is a member of echinodermata, phylum echinodermata
is a kind of class
CIDE DICTIONARY
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. [1913 Webster]