Aristotle\'s lantern

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:
so called from a reference by Aristotle to a sea urchin resembling in shape certain lanterns
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Aristotle's lantern is always a great word to know.
So is bird. Does it mean:
cold-blooded vertebrate comprised of frogs and toads, newts and salamanders and caecilians
warm-blooded vertebrate with feathers, wings, scaly legs and beak which bear young in shelled eggs
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