laryngotracheobronchitis

noun

la·​ryn·​go·​tra·​cheo·​bron·​chi·​tis -ˌtrā-kē-ō-brän-ˈkīt-əs, -bräŋ- 

plural laryngotracheobronchitides -ˈkit-ə-ˌdēz 

: inflammation of the larynx, trachea, and bronchi

specifically : an acute severe infection of these parts marked by swelling of the tissues and excessive secretion of mucus leading to more or less complete obstruction of the respiratory passages