proestrus

[ proh-es-truh s ]
/ proʊˈɛs trəs /

noun

the period immediately preceding estrus.
Also pro-oestrus.

Origin of proestrus

First recorded in 1920–25; pro-1 + estrus

British Dictionary definitions for proestrus

proestrus
/ (prəʊˈɛstrəs, -ˈiːstrəs) /

noun

the usual US spelling of pro-oestrus

Medical definitions for proestrus

proestrus
[ prō-ĕstrəs ]

n.

The period immediately before estrus in most female mammals, characterized by development of the endometrium and ovarian follicles.