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estriol

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WordReference Random House Unabridged Dictionary of American English © 2025

es•tri•ol n.

Biochemistryan estrogenic hormone, C₁₈H₂₁(OH)₃, occurring in urine during pregnancy.
Drugs[Pharm.]a commercial form of this compound, obtained from human placentas or the urine of pregnant women, used in conditions involving estrogen deficiency.

es(trin) + tri- + -ol¹ 1930–35

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