heart urchin

noun

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

heart urchin

noun

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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Word History and Origins

Origin of heart urchin¹

First recorded in 1835–45

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Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

According to the Cornwall Wildlife Trust, the sea potato, which is also known as a heart urchin, lives buried in up to 15cm of sand or muddy sediment.