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Webster's 1913 Dictionary

ECHINOIDEA

Ech `i *noi "de *a, n. pl. Etym: [NL. See Echinus, and -oid.] (Zoöl.)

Defn: 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. [Written also Echinidea, and Echinoida.]

New American Oxford Dictionary

Echinoidea

Ech i noi de a |ˌekəˈnoidēə ˌɛkəˈnoɪdiə |Zoology a class of echinoderms that comprises the sea urchins. ORIGIN modern Latin (plural ), from echinus .

Oxford Dictionary

Echinoidea

Echinoidea |ˌɛkɪˈnɔɪdɪə | ▶plural noun Zoology a class of echinoderms that comprises the sea urchins. ORIGIN modern Latin (plural ), from echinus .