from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun biochemistry The steroid hormone
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a naturally occurring weak estrogenic hormone secreted by the mammalian ovary; synthesized (trade name Estronol) and used to treat estrogen deficiency
from The American Heritage® Dictionary of the English Language, 4th Edition
[Greek thēlus, female; see dhē(i)- in Indo-European roots + –in.]
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