Adjective "pineal" definition and examples

(Pineal may not be an adjective, but it can be used as an adjective, click here to find out.)



Definitions and examples


A pea-sized conical mass of tissue behind the third ventricle of the brain, secreting a hormone-like substance in some mammals.
  1. '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.'
  2. 'Melatonin and serotonin are indoleamines derived from tryptophan which are produced by the pineal gland in vertebrates.'
  3. 'A gland in the brain known as the pineal gland produces the hormone melatonin when the body is exposed to light - sunlight or artificial light.'
  4. 'Apparently, psychoactive substances stimulate the pineal gland in the brain.'
  5. 'Melatonin is a hormone produced by the pineal gland, a small organ deep in the mammalian brain that conveys information to the rest of the brain and body about the length of light-dark cycles.'
  6. 'This diurnal variation in melatonin synthesis is brought about by norepinephrine secreted by the postganglionic sympathetic nerves that innervate the pineal gland.'
  7. 'Melatonin is produced and secreted by the pineal gland, whose activity is regulated by the suprachiasmatic nuclei.'
  8. 'The major glands that make up the human endocrine system are the hypothalamus, pituitary, thyroid, parathyroids, adrenals, pineal body, and the reproductive glands, which include the ovaries and testes.'
  9. 'Melatonin is a hormone that is naturally secreted in the evening from the pineal gland in the brain and tells the brain it is time to sleep.'
  10. 'One theory is that it is related to the amount of melatonin in the body, a hormone secreted by the pineal gland.'

More definitions

1. resembling a pine cone in shape.

2. of or relating to the pineal body.

More examples(as adjective)

"glands can be pineal."

"tumours can be pineal."

"syndromes can be pineal."

"hormones can be pineal."


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