# pineal recess

> English word · Noun

## Definitions
1. 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.

## Etymology
From pineal + recess.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/pineal-recess