from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A small, cone-shaped organ in the brain of most vertebrates that secretes the hormone melatonin. Also called epiphysis, pineal body, pineal organ.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A small, pinecone-shaped endocrine gland found near the centre of the brain that produces melatonin.
from the GNU version of the Collaborative International Dictionary of English
- adj. a glandlike body in the roof of the third ventricle of the vertebrate brain; -- called also pineal body, epiphysis, conarium. In some animals it is connected with a rudimentary eye, the so-called pineal eye, and in other animals it is supposed to be the remnant of a dorsal median eye.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a small endocrine gland in the brain; situated beneath the back part of the corpus callosum; secretes melatonin
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