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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.
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