[pin-ee-uhl, pahy-nee-, pahy-nee-]
resembling a pine cone in shape.
of or pertaining to the pineal body.

1675–85; < Neo-Latin pīneālis, equivalent to Latin pīne(a) pine cone, noun use of feminine of pīneus of a pine tree (pīn(us) pine1 + -eus -eous) + -ālis -al1

prepineal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pineal (ˈpɪnɪəl, paɪˈniːəl)
1.  resembling a pine cone
2.  of or relating to the pineal gland
[C17: via French from Latin pīnea pine cone]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1681, in ref. to the gland in the brain, from Fr. pinéal, lit. "like a pine cone," from L. pinea "pine cone," from pinus "pine tree" (see pine (n.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

pineal pin·e·al (pĭn'ē-əl, pī'nē-)

  1. Having the form of a pine cone.

  2. Of or relating to the pineal body.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Melatonin secretion by the brain's pineal gland is switched on by darkness.
Melatonin is a hormone produced by the pineal gland that regulates sleep.
The pineal gland turns serotonin into melatonin based on the amount of light it receives during a day.
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