1. Zool. A genus of gadflies. The species which deposits its larvae in the nasal cavities of sheep is oestrus ovis.
2. A vehement desire.
3. Specifically: Physiol. The periodical sexual impulse of animals; the period during which female animals are most receptive to males; heat; rut.
n 1: applies to nonhuman mammals: a state or period of heightened
sexual arousal and activity [syn: estrus, heat, rut]
2: type genus of the Oestridae: sheep botflies [syn: genus