heart urchin

noun

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

Origin of heart urchin

First recorded in 1835–45

Words nearby heart urchin

heart sound, heart stands still, heart starter, heart tamponade, heart to heart, heart urchin, heart's content, heart-free, heart-healthy, heart-lung machine, heart-rending

British Dictionary definitions for heart urchin

heart urchin

noun

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