parietal eye
noun
1
: pineal gland
—used especially for a pineal gland that possesses a photoreceptive function
called also pineal eye
2
: a photoreceptive structure of some nonmammalian vertebrates (such as lizards) especially when eyelike in composition with a distinguishable lens and retina
called also pineal eye
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Merriam-Webster unabridged
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