A female hormone found in horses and other equine animals, particularly abundant in the urine of pregnant mares.
From Latin 'equus' (horse) plus the chemical suffix '-in'. The term was coined in early 20th-century biochemistry when this specific hormone was isolated and identified in equine biology.
Equilin is the reason 'Premarin' (a hormone replacement therapy for humans) is literally made from pregnant mare urine—it's been used in medicine for decades because horse hormones are similar enough to human ones to work therapeutically.
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