(in some reptiles and lower vertebrates) an eye-like structure on the top of the head, covered by almost transparent skin and derived from or linked to the pineal.
〔动〕（某些爬行动物和低级脊椎动物头顶上的）松果眼
Example sentencesExamples
Researchers at the University of Maryland have found that larval blind cavefish retain a functioning pineal eye that is capable of detecting light.
A pineal eye was present, although not usually open to the surface.
Definition of pineal eye in US English:
pineal eye
noun
Zoology
(in some reptiles and lower vertebrates) an eye-like structure on the top of the head, covered by almost transparent skin and derived from or linked to the pineal.
〔动〕（某些爬行动物和低级脊椎动物头顶上的）松果眼
Example sentencesExamples
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.