Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of echinoid is as below...

Echinite :: Echinite (n.) A fossil echinoid.

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..

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

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

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

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

Echinid :: Echinid (a. & n.) Same as Echinoid.

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.

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