The adjective for alveolus (singular) or alveoli (plural) is alveolar.
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mammary alveolus
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Alveolar macrophage cells work to clear particles from the
alveolus by phagocytosis. If this process is overcome by continued
build up of particles then the alveolus becomes damaged. Once an
alveolus is blocked there isn't much you can do.
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One alveolus is a singular, tiny air sac of the lung, surrounded by a network of capillaries, and through which oxygen and carbon dioxide are exchanged. A cluster of such air sacs are alveoli (plural of alveolus).