• WordNet 3.6
    • n acinus one of the small sacs or saclike dilations in a compound gland
    • n acinus one of the small drupes making up an aggregate or multiple fruit like a blackberry
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Webster's Revised Unabridged Dictionary
    • Acinus (Bot) A grapestone.
    • Acinus (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.
    • Acinus (Bot) One of the small grains or drupelets which make up some kinds of fruit, as the blackberry, raspberry, etc.
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Century Dictionary and Cyclopedia
    • n acinus In botany: One of the small drupelets or berries of an aggregate baccate fruit, as the blackberry, etc., or the contained stone or seed. See cut under Rubus. A grape-stone.
    • n acinus In anatomy: Formerly, the smallest lobule of a gland, Now, generally, the smallest saccular subdivision of an acinose gland, several of which subdivisions make up a lobule. Also called alveolus. A lobule of the liver.
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Webster's Revised Unabridged Dictionary
L., grape, grapestone