ESTRUM
- estrus (the period of heat in female mammals) [n ESTRUMS]
- the period of heat in female mammals, also OESTRUM, ESTRUS, OESTRUS [n -S]
- the period of heat or rut; the period of maximum sexual receptivity of the female
- series of physiological changes in sexual and other organs in female mammals, extending from one period of heat to the next, accompanied by behavioral changes indicating interest in mating