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Definition of: estrus
(es′trəs, ēs′-) noun 
1. Zool. The peak of the sexual cycle in animals, culminating in ovulation; heat or rut, especially in female mammals. 
2. A violent or passionate impulse, craving, or stimulus; specifically, erotic desire. Also spelled oestrus, oestrum. [<L oestrus frenzy, passion <Gk. oistros a gadfly] 
—es′tru·al adjective
				
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