Echinoids

echinoid

[ih-kahy-noid, ek-uh-noid]
adjective
1.
belonging or pertaining to the class Echinoidea, comprising mainly sea urchins and sand dollars.
noun
2.
any echinoderm of the Echinoidea.

Origin:
1850–55; < Neo-Latin Echinoidea; see echinus, -oidea

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World English Dictionary
echinoid (ɪˈkaɪnɔɪd, ˈɛkə-)
 
n
1.  any of the echinoderms constituting the class Echinoidea, typically having a rigid ovoid body. The class includes the sea urchins and sand dollars
 
adj
2.  of or belonging to this class

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