|pineal gland or pineal body|
|epiphysis, Technical names: epiphysis cerebri a pea-sized organ in the brain, situated beneath the posterior part of the corpus callosum, that secretes melatonin into the bloodstream|
|pineal body or pineal body|
pineal gland n.
See pineal body.
A small gland located near the brain and primarily involved in the production and secretion of the hormone melatonin, which regulates circadian rhythms in many animals, including humans.