Share this entry
pineal Line breaks: pin¦eal
Pronunciation: /ˈpɪnɪəl/
(also pineal gland, pineal body)

Definition of pineal in English:


A pea-sized conical mass of tissue behind the third ventricle of the brain, secreting a hormone-like substance in some mammals.
Example sentences
  • Other distinct anatomic structures such as the pineal gland and third ventricle could not be identified due to autolysis.
  • The cells of the suprachiasmatic nucleus send signals to other parts of the brain, especially the pineal gland, initiating hormonal and nerve signals that synchronize the body and the brain to the biological clock.
  • Melatonin is a hormone secreted at night by the pineal gland of the brain.


Late 17th century: from French pinéal, from Latin pinea 'pine cone'. The anatomical term refers to the shape of the gland.

Definition of pineal in:
Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Subscribe to remove ads and access premium resources