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Aristotle's lantern

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noun Zoology.
  1. a complex arrangement of muscles and calcareous teeth and plates forming an eversible organ in most echinoids, functioning in mastication.
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Origin of Aristotle's lantern

so called from a reference by Aristotle to a sea urchin resembling in shape certain lanterns
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018