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See parietal eye.
(Zoology) an outgrowth of the pineal gland that forms an eyelike structure on the top of the head in certain cold-blooded vertebrates
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|Noun||1.||pineal eye - a sensory structure capable of light reception located on the dorsal side of the diencephalon in various reptiles|
sense organ, sensory receptor, receptor - an organ having nerve endings (in the skin or viscera or eye or ear or nose or mouth) that respond to stimulation