Dictionary and Thesaurus

Definition of Echinoidea

• (n. pl.) 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.

Synonyms of Echinoidea

• Echinoidea
• Class Echinoidea

Antonyms of Echinoidea

Homophones of Echinoidea