noun Pathology.
inflammation of the layers of an artery or of many arteries, usually caused by a severe hypersensitivity reaction, and characterized by nodules and hemorrhage along the involved vessels.

1905–10; < Neo-Latin; see poly-, arteritis

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polyarteritis pol·y·ar·te·ri·tis (pŏl'ē-är'tə-rī'tĭs)
Simultaneous inflammation of a number of arteries.

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