parietal eye

noun

1. Zoology. a median outgrowth of the diencephalon anterior to the pineal apparatus, having visual adaptations in many anamniotes and lizards.

Word History and Origins

Origin of parietal eye¹

First recorded in 1885–90

Example Sentences

In other words, the parietal eye can not be differentiated from any other tubercle except by its position.

From Project Gutenberg

It is claimed that most, if not all, trilobites possessed a median or parietal eye on the glabella.

From Project Gutenberg