pineal eyen

pineal eye

noun
an eyelike structure that develops from the pineal apparatus in certain cold-blooded vertebrates.
Also called third eye.


Origin:
1885–90

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
pineal eye
 
n
an outgrowth of the pineal gland that forms an eyelike structure on the top of the head in certain cold-blooded vertebrates

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
pineal eye   (pĭn'ē-əl, pī'nē-əl)  Pronunciation Key 
A sensory structure capable of light reception, appearing as a spot on the top of the head in lampreys, hagfish, amphibians, and some reptiles, especially the tuatara. Pineal eyes can contain a rudimentary cornea, lens, cone cells, and retina, and are thought to be sensitive to light and dark but not to be able to form images.
The American Heritage® Science Dictionary
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