(ASS ih nye): Plural; singular, acinus. The grape-shaped secretory portion of a gland. The sebaceous gland is made up of acini.

The parts of the breast gland where fluid or milk is produced (singular: acinus).

Any small saclike component of the gland

masses of cells in the pancreas that secrete digestive enzymes

(AHS-ih-nee) Clusters of cells in the pancreas that secrete digestive enzymes.