ECHINOIDEA

Echinoidea, class Echinoidea

(noun) sea urchins and sand dollars

Source: WordNet® 3.1

Ech`i*noi"de*a, n. pl. Etym: [NL. See Echinus, and -oid.] (Zoöl.)

Definition: 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.]

Source: Webster’s Unabridged Dictionary 1913 Edition

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