adjective
or oes·trous ˈestrəs, chiefly Brit ˈēs- ; also es·tral or oes·tral -rəl ; or es·tru·al or oes·tru·al -rəwəl
Etymology: New Latin estr us, oestr us + English -ous or -al
1. : of, relating to, or characteristic of estrus
the estrous state
estrous keratinization of the vaginal mucosa
2. : exhibiting estrus : being in heat
the estrous bitch