pineal eye

noun

an eyelike structure that develops from the pineal apparatus in certain cold-blooded vertebrates.

Origin of pineal eye

First recorded in 1885–90

Also called third eye.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for pineal eye

pineal eye

noun

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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

pineal eye in Science

pineal eye

[pĭn′ē-əl, pī′nē-əl]

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.