| n. | 1. | (Bot.) One of the small grains or drupelets which make up some kinds of fruit, as the blackberry, raspberry, etc. |
| 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. |
| Noun | 1. | acinus - one of the small drupes making up an aggregate or multiple fruit like a blackberry |
| 2. | acinus - one of the small sacs or saclike dilations in a compound gland |