Medical Dictionary


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noun Or·ni·thon·ys·sus \ˌȯr-nə-ˈthän-ə-səs, -thə-ˈnis-əs\

Medical Definition of Ornithonyssus

  1. :  a genus of mites (family Macronyssidae) that are parasitic on vertebrates and include the rat mite (O. bacoti) and two serious pests (O. bursa and O. sylviarum) of domestic fowl

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