proestrous

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adjective

pro·​es·​trous -ˈes-trəs 

variants or chiefly British pro-oestrous

-ˈēs- 

: of or relating to proestrus

pro-oestrogen, pro-oestrous, pro-oestrum, pro-oestrus

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chiefly British variant of proestrogen, proestrous, proestrum, proestrus