'Echinoidea' definitions:
Definition of 'Echinoidea'
From: WordNet
noun
Sea urchins and sand dollars [syn: Echinoidea, class Echinoidea]
Definition of 'Echinoidea'
From: GCIDE
- 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]