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[pin-ee-uh l, pahy-nee-, pahy-nee-] /ˈpɪn i əl, ˈpaɪ ni-, paɪˈni-/
resembling a pine cone in shape.
of or relating to the pineal body.
Origin of pineal
1675-85; < New 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
Related forms
prepineal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for pineal
  • 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.
British Dictionary definitions for pineal


/ˈpɪnɪəl; paɪˈniːəl/
resembling a pine cone
of or relating to the pineal gland
Word Origin
C17: via French from Latin pīnea pine cone
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for pineal

1680s, in reference to the gland in the brain, from French pinéal, literally "like a pine cone," from Latin pinea "pine cone," from pinus "pine tree" (see pine (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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pineal in Medicine

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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