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plural acini
(botany) One of the small grains or drupelets which make up some kinds of fruit, as the blackberry, raspberry, etc. examples
(botany) A grape-stone. examples
(anatomy) 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. quotations examples
Their smallest lobules were called acini, a term which has also been used to denote the saccular recesses in the lobules […]
1828, Jones Quain, Quain's elements of anatomy