noun
estriol; oestriol
A naturally occurring estrogen hormone, especially important during pregnancy. Medical/biological term.
エストリオールは妊娠中に胎盤で産生されるエストロゲンの一種です。
Estriol is a type of estrogen produced by the placenta during pregnancy.
エストロゲン is the general term for estrogen hormones; エストリオール is one specific type.
エストラジオール is the most potent estrogen; エストリオール is weaker and mainly produced during pregnancy.
Loanword from English 'estriol' (or 'oestriol'), ultimately derived from 'estrus' + 'triol' (indicating three hydroxyl groups).