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The ending of a tiny airway in the lung, where the alveoli (air sacs) are located.Acinus, pulmonary: The ending of a tiny airway in the lung, where the alveoli (air sacs) are located.In anatomy, an acinus is a round cluster of cells, usually epithelial cells, that looks somewhat like a knobby berry.The word "acinus" means "berry" in Latin. (The plural is "acini".) There are also acini, round clusters of epithelial cells, in the salivary glands and in the pancreas.