echinoid

[ih-kahy-noid, ek-uh-noid]
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adjective

belonging or pertaining to the class Echinoidea, comprising mainly sea urchins and sand dollars.

noun

any echinoderm of the Echinoidea.

Origin of echinoid

1850–55; < New Latin Echinoidea; see echinus, -oidea
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for echinoid

echinoid

noun

any of the echinoderms constituting the class Echinoidea, typically having a rigid ovoid body. The class includes the sea urchins and sand dollars

adjective

of or belonging to this class
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