proestrogen

noun
pro·​es·​tro·​gen | \ (ˈ)prō-ˈes-trə-jən How to pronounce proestrogen (audio) \
variants: or chiefly British pro-oestrogen \ -​ˈēs-​ How to pronounce pro-oestrogen (audio) \

Medical Definition of proestrogen

: a precursor of an estrogen that must undergo metabolism before becoming an active hormone

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