Definitions for "Pineal"
Of or pertaining to a pine cone; resembling a pine cone.
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pinea = pine cone; cone-shaped gland of the brain; cf. conarium.
relating to the pineal body; "pineal hormone"
a tiny organ in the brain that helps to regulate sleep patterns in mammals [i.e. circadian rhythm], as well as seasonal changes. It is sensitive to light - in the absence of light, it produces a hormone (melantonin) that makes us sleep. Functionally, it is the closest thing we have to a "third eye".