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Medical Definition of Ornithonyssus
1. A genus of bird and rodent mites; species include Ornithonyssus bacoti, the tropical rat mite, a possible vector of murine typhus and a cause of human dermatitis; Ornithonyssus bursa, the tropical fowl mite; and Ornithonyssus sylviarum, the northern fowl mite. Origin: G. Ornis (ornith-), bird, + nyssus, to prick (05 Mar 2000)