|perēˌärd.ə|rīd.əsnōˈdōsə noun
Etymology: New Latin, from periarteritis (from peri- + arteritis ) + Latin nodosa, feminine of nodosus knotty, nodose — more at nodose
: an acute inflammatory disease that involves all layers of the arterial wall and is characterized by degeneration, necrosis, exudation, and the formation of inflammatory nodules along the outer layer