Definition of Echinaidea
||Ech`i*noi"de*a (?), n. pl. [NL. See
Echinus, and -oid.] (Zoöl.) 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.]
- Webster's Unabridged Dictionary (1913)
Translingual
- a taxonomic class, within superclass Cryptosyringida - the sea urchins
- The Nuttall Encyclopedia
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