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Echinoidea :: Echinoidea (n. pl.) 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..

Echinidan :: Echinidan (n.) One the Echinoidea.

Sea Urchin :: Sea urchin () Any one of numerous species of echinoderms of the order Echinoidea.

Paleechinoidea :: Paleechinoidea (n. pl.) An extinct order of sea urchins found in the Paleozoic rocks. They had more than twenty vertical rows of plates. Called also Palaeechini.

Echinoid :: Echinoid (a.) Of or pertaining to the Echinoidea.

Echinoid :: Echinoid (n.) One of the Echinoidea.

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