Estriol definitions

ĕs'trī-ôl', -ōl', -ŏl', ĕ-strī'-
An estrogenic hormone, C18 H24 O3 , that is a metabolite of estradiol and is present chiefly during pregnancy. It is produced by the placenta and is found in the urine of pregnant women.
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An estrogenic hormone, C18 H24 O3 , that is a metabolite of estradiol and is present chiefly during pregnancy. It is produced by the placenta and is found in the urine of pregnant women.
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A female sex hormone, C18H24O3, present in the urine during pregnancy, thus indicating normal fetal and placental activity.
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An estrogenic hormone, C18 H24 O3 , that is a metabolite of estradiol and is present chiefly during pregnancy. It is produced by the placenta and is found in the urine of pregnant women.
noun
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(organic chemistry) A steroid hormone produced mostly during pregnancy.
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Origin of estriol

es(trus) tri– –ol