heart urchin

  1. 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

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use heart urchin in a sentence

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

    The Sea-beach at Ebb-tide | Augusta Foote Arnold

British Dictionary definitions for heart urchin

heart urchin

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

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012