Echinoidea

Echinoidea

Ech`i*noi"de*a\, n. pl. [NL. See Echinus, and -oid.] (Zo["o]l.) The class Echinodermata which includes the sea urchins. They have a calcareous, usually more or less spheroidal or disk-shaped, composed of many united plates, and covered with movable spines. See Spatangoid, Clypeastroid. [Written also Echinidea, and Echinoida.]
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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