Definition of pineal eye in English:

pineal eye

Syllabification: pin·e·al eye

noun

Zoology
  • (In some reptiles and lower vertebrates) an eyelike structure on the top of the head, covered by almost transparent skin and derived from or linked to the pineal body.
    More example sentences
    • A pineal eye was present, although not usually open to the surface.
    • Researchers at the University of Maryland have found that larval blind cavefish retain a functioning pineal eye that is capable of detecting light.

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