Echinidea

1 definition found

From The Collaborative International Dictionary of English v.0.48 [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]