Diestrous and Diestrum

Diestrous adjective - (of animals that have several estrous cycles in one breeding season) in a period of sexual inactivity.

Diestrum and diestrous are semantically related. In some cases you can use "Diestrum" instead a noun "Diestrous".

Diestrum noun - (of animals having several estrous cycles in one breeding season) a state or interval of sexual inactivity or quiescence between periods of activity.

Diestrous and diestrum are semantically related. Sometimes you can replace term "Diestrous" with "Diestrum", this nouns are similar.