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heart urchin

American  

noun

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

heart urchin British  

noun

  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

Etymology

Origin of heart urchin

First recorded in 1835–45

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.