estrogen

Multiple Entries:
  estrogen    oestrogen  

Concise Oxford English Dictionary © 2008 Oxford University Press:
estrogen etc.
noun US spelling of oestrogen etc.

Concise Oxford English Dictionary © 2008 Oxford University Press:
oestrogen /ˈiːstrədʒ(ə)n, ˈɛstrə-/ (US estrogen)
noun any of a group of steroid hormones which promote the development and maintenance of female characteristics of the body.
– derivatives
oestrogenic adjective.
– origin 1920s: from oestrus + -gen.
'estrogen' also found in these Oxford entries:

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