Zoology. a median outgrowth of the diencephalon anterior to the pineal apparatus, having visual adaptations in many anamniotes and lizards.
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How to use parietal eye in a sentence
In other words, the parietal eye can not be differentiated from any other tubercle except by its position.The Appendages, Anatomy, and Relationships of Trilobites | Percy Edward Raymond
It is claimed that most, if not all, trilobites possessed a median or parietal eye on the glabella.The Appendages, Anatomy, and Relationships of Trilobites | Percy Edward Raymond