bronchus-associated lymphoidtissue

bron·chus-as·so·ci·at·ed lym·phoidtis·sue

(BALT) (brong'kŭs-ă-sō'sē-ā-tĕd lim'foyd tish'ū)
Patches of lymphoid tissues composed mainly of B and T lymphocytes and extending throughout the bronchial airways of the lung.