oestrus

As a proper noun oestrus

is .

As an adjective estrous is

of, pertaining to, or in a state of estrus.

As an adjective oestrous

is an alternative spelling of estrous.

As a noun oestrus is

a biting fly of the genus Oestrus; a botfly.

As a noun oestrum

is .

As a proper noun oestrus is

.

As a proper noun oestrus

is .

As a noun proestrus is

a phase of the oestrus cycle, prior to sexual receptivity, during which one or more follicles of the ovary begin to grow.

As nouns the difference between oestrus and metestrus

is that oestrus is a biting fly of the genus Oestrus; a botfly while metestrus is a phase of the oestrus cycle where the signs of oestrogen stimulation subside, the corpus luteum starts to form, and the uterine lining begins to secrete small amounts of progesterone.

As a proper noun oestrus

is .

As a noun dioestrus is

a period of sexual inactivity (in female mammals) between periods of oestrus.