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echinoidea (medicine)


echinoidea
<zoology> 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.

Alternative forms: Echinidea, and Echinoida.

Origin: NL. See Echinus, and -oid.

Source: Websters Dictionary