heart urchin

noun

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

heart urchin

noun

1. any echinoderm of the genus Echinocardium, having a heart-shaped body enclosed in a rigid spiny test: class Echinoidea (sea urchins)

Word History and Origins

Origin of heart urchin¹

First recorded in 1835–45

Example Sentences

A very large heart-urchin, found on the southern coast of Florida and in the West Indies in shallow water.

From Project Gutenberg