Echinoid definition

ĭ-kīnoid
An echinoderm of the class Echinoidea, which includes the sand dollars and sea urchins.
noun
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Of or like a sea urchin.
adjective
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Any of a class (Echinoidea) of echinoderms, including the sea urchins and sand dollars.
noun
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(zoology) Any sea urchin or sea dollar of the class Echinoidea.
noun
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Other Word Forms

Noun

Singular:
echinoid
Plural:
echinoids