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
Echinus + -oidea (Wiktionary)