pro-oestrumproestrumn.
/prəʊˈiːstrəm/, /prəʊˈɛstrəm/, U.S. /proʊˈɛstrəm/ Biology. Now rare.
= pro-oestrus n.
ΘΚΠ
the world > animals > animal body > general parts > sexual organs and reproduction > [noun] > mating > rut > phases of
diœstrus1900
pro-oestrum1900
1900 W. Heape in Q. Jrnl. Microsc. Sci. Nov. 6 Pro-œstrum or the Pro-œstrous Period..I have adopted to describe the first phases of generative activity in the female mammal at the beginning of a sexual season.
1943 Ecol. Monogr. 13 436/2 Clotted blood in the urine along the trail of the female may be evidence of the close of pro-oestrum.
1977 Amer. Midland Naturalist 98 110 Both females attained proestrum 5-7 days after the injection [of estrogen].
This entry has been updated (OED Third Edition, June 2007; most recently modified version published online March 2022).
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