parietal eye
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Related to parietal eye: pineal eye
pin·e·al eye
a non-image-forming, photoreceptive eye in or near the median line in certain crustacea and lower vertebrates; homologue of pineal gland in higher forms.
Synonym(s): epiphysial eye, parietal eye
parietal eye
n.
A photosensory organ located on the top of the head of certain reptiles, chiefly lizards. Also called pineal eye, third eye.