acinus

noun3

1. •
   One of the small grains or drupelets which make up some kinds of fruit, as the blackberry, raspberry, etc.
2. •
   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 […] — 1828
3. •
   A grape-stone.