third eye

English Thesaurus

1. a sensory structure capable of light reception located on the dorsal side of the diencephalon in various reptiles (noun.body)

hypernym	:	receptor, sense organ, sensory receptor,
definition	:	an organ having nerve endings (in the skin or viscera or eye or ear or nose or mouth) that respond to stimulation (noun.body)

part meronym	:	betweenbrain, diencephalon, interbrain, thalmencephalon,
definition	:	the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon (noun.body)