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echinoid

American  
[ih-kahy-noid, ek-uh-noid] / ɪˈkaɪ nɔɪd, ˈɛk əˌnɔɪd /

adjective

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

noun

  1. any echinoderm of the Echinoidea.

echinoid British  
/ ɪˈkaɪnɔɪd, ˈɛkə- /

noun

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

"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

adjective

  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

Etymology

Origin of echinoid

1850–55; < New Latin Echinoidea; echinus, -oidea

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.