Word Meanings - ECHINID - Book Publishers vocabulary database

See ECHINOID

Related words: (words related to ECHINID)

• ECHINOID
  Of or pertaining to the Echinoidea. -- n.
• ECHINOIDEA
  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.
• PALEECHINOIDEA
  An extinct order of sea urchins found in the Paleozoic rocks. They had more than twenty vertical rows of plates. Called also Palæechini.