acinus

rauhasrakkula puhekieltä One of the small grains or drupelets which make up some kinds of fruit, as the blackberry, raspberry, etc.
puhekieltä A grape-stone.
puhekieltä 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.
Richard Quain, Quains elements of anatomy''

Their smallest lobules were called acini, a term which has also been used to denote the saccular recesses in the lobules (..)