ac·i·nus / ˈasənəs/ • n. (pl. -ni / -ˌnī/ ) Anat. 1. a small saclike cavity in a gland, surrounded by secretory cells.2. a region of the lung supplied with air from one of the terminal bronchioles.
acinus (pl. acini) The smallest unit of a multilobular gland, such as the pancreas. Each acinus in the pancreas is made up of a hollow cluster of acinar cells, which produce the digestive enzymes secreted in pancreatic juice. Minute ducts from the pancreatic acini eventually drain into the pancreatic duct.
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