%acinus%

‖n.; pl. Acini [ L., grape, grapestone. ] 1. (Bot.) (a) One of the small grains or drupelets which make up some kinds of fruit, as the blackberry, raspberry, etc. (b) A grapestone. [ 1913 Webster ]

2. (Anat.) 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. Quain. [ 1913 Webster ]