estrogen
//ˈɛstrədʒən//
Noun
estrogenSingular
estrogensPlural
1
A group of steroid hormones produced primarily by the ovaries that promote the development and maintenance of female secondary sexual characteristics and regulate the reproductive cycle.
Estrogen levels fluctuate throughout the menstrual cycle.
2
Any synthetic compound that mimics the effects of natural estrogen hormones, often used in hormone replacement therapy or contraceptives.
The doctor prescribed a synthetic estrogen for her hormone replacement therapy.