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Botany. one of the small drupelets or berries of an aggregate, baccate fruit, as the blackberry.
a berry, as a grape or currant.
Anatomy.

a minute rounded lobule.
the smallest secreting portion of a gland.

Historical Examples

The organ showed prominent structure, the centres of the acini being red, the periphery lighter in color.
Plague Thomas Wright Jackson

The centres of the acini showed parenchymatous and fatty degeneration.
Plague Thomas Wright Jackson

acini: granulations, like those on a blackberry: the terminal secreting tubes of glands.
Explanation of Terms Used in Entomology John. B. Smith

The acini surrounded with a dense, cellular texture, paler than themselves; 2.
North American Medical and Surgical Journal, Vol. 2, No. 3, July, 1826 Various

The glands of Lieberkhn elongate, the number of acini increases, and the contained cells multiply.
A System of Practical Medicine By American Authors, Vol. II Various

The acini are imbedded in a mass of adipose tissue which contains the vessels and nerves.
A System of Practical Medicine By American Authors, Vol. II Various

Those of the vena portæ spread around the acini, or granulations of the liver; and 4.
North American Medical and Surgical Journal, Vol. 2, No. 3, July, 1826 Various

The cells on the periphery of the acini exhibited typical fatty infiltration.
Plague Thomas Wright Jackson

The liver was softer than natural, and exhibited a notable yellowishness in the centre of the acini.
Poisons: Their Effects and Detection Alexander Wynter Blyth

Edema occurs frequently, the fluid in the acini often containing red blood-cells.
Scurvy Past and Present Alfred Fabian Hess

noun (pl) -ni (-ˌnaɪ)
(anatomy) any of the terminal saclike portions of a compound gland
(botany) any of the small drupes that make up the fruit of the blackberry, raspberry, etc
(botany, obsolete) a collection of berries, such as a bunch of grapes

acinus ac·i·nus (ās’ə-nəs)
n. pl. ac·i·ni (-nī’)
Any of several minute grape-shaped secretory portions of an acinous gland.
a·cin’ic (ə-sĭn’ĭk) or ac’i·nose’ (ās’ə-nōs’) or ac’i·nous (-nəs) adj.