| Noun | 1. | anestrus - applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrusdiestrum, diestrus - (of animals having several estrous cycles in one breeding season) a state or interval of sexual inactivity or quiescence between periods of activity estrus, oestrus, rut, heat - applies to nonhuman mammals: a state or period of heightened sexual arousal and activity | |