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WORDNET DICTIONARY
CIDE DICTIONARY
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WORDNET DICTIONARY
Noun sea urchin has 1 sense
- sea urchin(n = noun.animal) - shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells; is a kind of echinoderm
is a member of class echinoidea, echinoidea
has particulars: echinus esculentus, edible sea urchin, sand dollar, heart urchin
CIDE DICTIONARY
sea urchin,
Any one of numerous species of echinoderms of the order Echinoidea .
"When living they are covered with movable spines which are often long and sharp."
[1913 Webster]