Definition of Echinoida. Meaning of Echinoida. Synonyms of Echinoida
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Definition of Echinoida
Echinoida 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, 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.]