chalone

[kal-ohn]

chal·one

[kal-ohn]
noun Physiology.
an endocrine secretion that depresses or inhibits physiological activity.

Origin:
1910–15; < Greek chalôn, present participle of chalân to slacken, loosen; on the model of hormone
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Chalone is always a great word to know.
So is REM sleep. Does it mean:
a period of sleep during which most dreaming occurs as the eyes move under closed lids and the skeletal muscles are deeply relaxed
the movement of an organism in response to a stimulus such as light
Collins
World English Dictionary
chalone (ˈkæləʊn)
 
n
any internal secretion that inhibits a physiological process or function
 
[C20: from Greek khalōn, from khalan to slacken]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

chalone cha·lone (kā'lōn', kāl'ōn')
n.

  1. A hormone that inhibits rather than stimulates.

  2. Any of several polypeptides produced by a tissue and causing the reversible inhibition of mitosis in cells of that tissue.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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