'Paleechinoidea' definitions:

Definition of 'Paleechinoidea'

From: GCIDE
  • Paleechinoidea \Pa`le*["e]ch`i*noi"de*a\, n. pl. [NL. See Paleo-, and Echinoidea.] (Zool.) An extinct order of sea urchins found in the Paleozoic rocks. They had more than twenty vertical rows of plates. Called also Palaeechini. [Written also Palaeechinoidea.] [1913 Webster]