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noun
A small anatomical space or diverticulum at the posterior of the brain's third ventricle, where it extends into the pineal gland; believed to be a key site for the hormone melatonin to enter the cerebrospinal fluid.
Definition source: English Wiktionary via Wiktextract
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Synonyms: none provided
Antonyms: none provided
History
From pineal + recess.
