heart-urchin

heart urchin

noun
an echinoderm of the order Spatangoida, having an elongate, somewhat heart-shaped outer covering.

Origin:
1835–45

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World English Dictionary
heart urchin
 
n
any echinoderm of the genus Echinocardium, having a heart-shaped body enclosed in a rigid spiny test: class Echinoidea (sea urchins)

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