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Aristotle's lantern

noun, Zoology
a complex arrangement of muscles and calcareous teeth and plates forming an eversible organ in most echinoids, functioning in mastication.
Origin of Aristotle's lantern
so called from a reference by Aristotle to a sea urchin resembling in shape certain lanterns Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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