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[Greek thēlus, female; see dhē(i)- in Indo-European roots + -in.]
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Noun1.theelin - a naturally occurring weak estrogenic hormone secreted by the mammalian ovary; synthesized (trade name Estronol) and used to treat estrogen deficiency
estrogen, oestrogen - a general term for female steroid sex hormones that are secreted by the ovary and responsible for typical female sexual characteristics
ketosteroid - a steroid containing a ketone group