Found 2 items, similar to Echinoidea.
English → English (WordNet) Definition: Echinoidea Echinoidea n : sea urchins and sand dollars [syn: class Echinoidea]
English → English (gcide) Definition: Echinoidea Echinoidea \Ech`i*noi"de*a\, n. pl. [NL. See Echinus, and -oid.] (Zo["o]l.) The class Echinodermata which includes the sea urchins. They have a calcareous shell, 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.] [1913 Webster] ||