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Echinoidea is a 10 letter word which starts with the letter E and ends with the letter A for which we found 1 definitions.

(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.
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