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WordReference Random House Unabridged Dictionary of American English © 2026
pineal eye, 
  1. Zoologyan eyelike structure that develops from the pineal apparatus in certain cold-blooded vertebrates. Also called third eye. 
  • 1885–90

Collins Concise English Dictionary © HarperCollins Publishers::
pineal eye n
  1. an outgrowth of the pineal gland that forms an eyelike structure on the top of the head in certain cold-blooded vertebrates
'pineal eye' also found in these entries (note: many are not synonyms or translations):

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