Echinoida

Echinoida
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 shell, 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}.] [1913 Webster] ||

The Collaborative International Dictionary of English. 2000.

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