estrone
noun
es·trone ˈe-ˌstrōn 
: a natural estrogenic hormone that is a ketone C18H22O2 found in the body chiefly as a metabolite of estradiol, that is also secreted especially by the ovaries, and that is used to treat various conditions (such as ovarian failure and menopausal symptoms) relating to estrogen deficiency
Example Sentences
Recent Examples on the Web Respeggt found a way around that: punch a 0.3-millimeter-wide hole in a shell, suck up a drop of embryonic urine, and test for estrone sulfate, a hormone only female chicks produce. 
Popular Science, 3 Dec. 2019
Popular Science, 3 Dec. 2019 Word History
Etymology
estrane
First Known Use
1933, in the meaning defined above
Medical Definition
estrone
noun
es·trone ˈes-ˌtrōn
variants or chiefly British oestrone
ˈē-ˌstrōn
: a natural estrogenic hormone that is a ketone C18H22O2 found in the body chiefly as a metabolite of estradiol, is also secreted especially by the ovaries, and is used to treat various conditions (as ovarian failure and menopausal symptoms) relating to estrogen deficiency see theelin
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