Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • proper n. A taxonomic class within the superclass Cryptosyringida — the sea urchins.

from the GNU version of the Collaborative International Dictionary of English

  • n.pl. The class Echinodermata which includes the sea urchins. They have a calcareous shell, usually more or less spheroidal or disk-shaped, composed of many united plates, and covered with movable spines. See spatangoid, clypeastroid.

from The Century Dictionary and Cyclopedia

  • A class of the phylum or subkingdom Echinodermata; the sea-urchins or sea-eggs.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. sea urchins and sand dollars

Etymologies

Echinus +‎ -oidea (Wiktionary)

Examples

  • These lowly animals belong to that group of the star-fish class (Echinodermata), the species of which possess generally spheroidal bodies, built up of multitudinous calcareous plates, and constitute the order Echinoidea.

    On the Genesis of Species

  • The mouth of the Echinoidea, often referred to as Aristotle's Lantern because of the way he first described it, is located at the central most part of the animal's circular, spiny body.

    CreationWiki - Recent changes [en]

  • The '' 'Long-spined sea urchin' '' is a member of the class [[Echinoidea]], which has the literal meaning spiny skin.

    CreationWiki - Recent changes [en]

  • Echinoidea, which has the literal meaning spiny skin.

    CreationWiki - Recent changes [en]

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