• synonyms


[ih-kahy-noid, ek-uh-noid]
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  1. belonging or pertaining to the class Echinoidea, comprising mainly sea urchins and sand dollars.
  1. 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. 2018

Examples from the Web for echinoid

Historical Examples

  • A pair of ciliated epaulettes on each side of and behind the ciliated ring is very characteristic of some Echinoid larv.

    The Works of Francis Maitland Balfour, Volume II (of 4)

    Francis Maitland Balfour

  • The rows of plates in an Echinoid which are not perforated for the emission of the "tube-feet."

British Dictionary definitions for echinoid


  1. any of the echinoderms constituting the class Echinoidea, typically having a rigid ovoid body. The class includes the sea urchins and sand dollars
  1. 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