estriol

noun

es·​tri·​ol ˈe-ˌstrī-ˌȯl 

e-ˈstrī-, 

-ˌōl 

: 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

Examples of estriol in a Sentence

Recent Examples on the Web

Powered by bioidentical estriol and peptides, the treatment is designed to help rebuild collagen, restore elasticity and improve skin density over time. — Kathryn Hopkins, Footwear News, 12 May 2026

Launching Tuesday and following on the heels of M4 Face Cream Rx, M4 Body Treatment Rx is a prescription estriol body treatment designed specifically for menopausal skin. — Kathryn Hopkins, Footwear News, 12 May 2026

Monica Molenaar, Alloy’s co-founder, first discovered estriol while living in the Netherlands. — Micaela English, Flow Space, 27 Aug. 2025

Living in the Netherlands, Molenaar was able to quickly get a vaginal estrogen prescription in the form of estriol quickly and within two weeks her symptoms were completely gone. — Emily Burns, Footwear News, 3 Sep. 2019

Both products feature the hero ingredient estriol, a form of estrogen, as well as a peptide to enhance the firming and smoothing effects. — Emily Burns, Footwear News, 3 Sep. 2019

Word History

Etymology

estrane + tri- + -ol entry 1

First Known Use

1933, in the meaning defined above

Rhymes for estriol

• extraterrestrial
• terrestrial

Medical Definition

estriol

noun

es·​tri·​ol ˈes-ˌtrī-ˌȯl  e-ˈstrī- 

-ˌōl

variants or chiefly British oestriol

ˈē-ˌstrī-ˌȯl  ē-ˈstrī- 

-ˌōl

: 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