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estop
estoppel
estradiol
estral
estrane
estrange
estranged
estreat
estriol
estrogen
estrogen-replacement therapy
estrone
estrous
estrous cycle
estrus
estuarine
estuary
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estriol
es·tri·ol [ éstree àwl ]


noun 
Definition:
 
hormone secreted during pregnancy: an estrogen produced in the ovaries and secreted in the urine during pregnancy
[Early 20th century. <estrus + tri-]
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