Definition of estriol
Origin and Etymology of estriol
estrane + tri- + 1-ol
First Known Use: 1933
Medical Definition of estriol
: a relatively weak natural estrogenic hormone that is a glycol C18H24O3 found in the body chiefly as a metabolite of estradiol, is the main estrogen secreted by the placenta during pregnancy, and is the estrogen typically found in the urine of pregnant women
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