acini >> /ˈasɪnəs/
Definition: [noun] A small saclike cavity in a gland, surrounded by secretory cells.
Example: The mass also contained cystic spaces lined by columnar epithelium, sebaceous glands, cartilage, smooth muscle, and pancreatic acini.
Definition: [noun] A region of the lung supplied with air from one of the terminal bronchioles.
Example: Primary bronchiolar disorders are separated from diseases primarily affecting more distal components of the pulmonary acinus and large airway diseases in which prominent secondary bronchiolar changes may be seen.