The story
Internationalism. From estratriene (“estra(triene)”) + diol. By surface analysis, estra- + di- + -ol.
Etymology from Wiktionary, CC BY-SA 4.0.
estradiol
Today it means: A natural estrogenic hormone that is a phenolic alcohol estra-1,3,5-triene-3,17-diol (C₁₈H₂₄O₂) secreted chiefly by the ovaries of all vertebrates, that is a major and the most potent of the naturally occurring estrogens; the semisynthetic esterified compound is used medicinally to treat estrogen deficiency and breast cancer. Full definition →