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echinoid

[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
2.
any echinoderm of the Echinoidea.
Origin
1850-1855
1850-55; < Neo-Latin Echinoidea; see echinus, -oidea
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for echinoids

echinoid

/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
adjective
2.
of or belonging to this class
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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