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Meaning of Aristotle's lantern

Ar'istot'le's lan'tern

Pronunciation: [key]
— Zool. Zool.
  1. a complex arrangement of muscles and calcareous teeth and plates forming an eversible organ in most echinoids, functioning in mastication.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.