‖Pa′le‐ëch′i‐noi″de‐a (?), n. pl. [NL. See Paleo-, and Echinoidea.] (Zoöl.) An extinct order of sea urchins found in the Paleozoic rocks. They had more than twenty vertical rows of plates. Called also Palæechini. [Written also Palæechinoidea.]
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.