noun
estrogen
EEST-ruhd-zhuhn
noun
1
A hormone produced mainly in the ovaries that regulates the female reproductive system and secondary sex characteristics.
"Estrogen levels fluctuate throughout the menstrual cycle."
How to Use Estrogen
Learner’s notesIn plain EnglishA key female sex hormone, produced mainly by the ovaries.
UK vs US
Spelled "oestrogen" in British English, "estrogen" in American English.
Word Forms
estrogens plural
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_____ levels fluctuate throughout the menstrual cycle.
Etymology
Built from Greek oistros ("frenzy," root of "estrus") plus the suffix "-gen," meaning "producer of" — so literally, "the thing that produces estrus."