acinus

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One of the small saclike dilations composing a compound gland.

from The Century Dictionary.

• noun 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.
• noun 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.

from the GNU version of the Collaborative International Dictionary of English.

• noun One of the small grains or drupelets which make up some kinds of fruit, as the blackberry, raspberry, etc.
• noun A grapestone.
• noun (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun botany One of the small grains or drupelets which make up some kinds of fruit, as the blackberry, raspberry, etc.
• noun botany A grape-stone.
• noun 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. - Richard Quain.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun one of the small sacs or saclike dilations in a compound gland
• noun one of the small drupes making up an aggregate or multiple fruit like a blackberry