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Noun
estriol
oestriol
Definition: a naturally occurring estrogenic hormone; a synthetic form is used to treat estrogen deficiency
Definition: 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.