acinus

One of the small grains or drupelets which make up some kinds of fruit, as the blackberry, raspberry, etc.

A grape-stone.

One of the granular masses which constitute a racemose or compound gland, as the pancreas; also, one of the saccular recesses in the lobules of a racemose gland.

Their smallest lobules were called acini, a term which has also been used to denote the saccular recesses in the lobules […]