English dictionary

Echinoidea

/,/E/k/@/'n//Oi//d/i//@/

Definitions, examples, synonyms and antonyms from WordNet 3.0.

noun

sea urchins and sand dollars

noun.animal

Synonyms class echinoidea

Source: WordNet 3.0
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 <u>Spatangoid</u>, <u>Clypeastroid</u>.

noun

Source: webster1913