‖Œs″trus (?), n. 1. (Zoöl.) A genus of gadflies. The species which deposits its larvæ in the nasal cavities of sheep is œstrus ovis.
2. A vehement desire; esp. (Physiol.), the periodical sexual impulse of animals; heat; rut.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.