acinus
noun
ac·i·nus ˈa-sə-nəs 
plural acini ˈa-sə-ˌnī
: any of the small sacs terminating the ducts of some exocrine glands and lined with secretory cells
acinous
ˈa-sə-nəs
adjective 
Word History
Etymology
borrowed from New Latin (in the phrase glandulosi acini,) literally, "glandular berries," used by Marcello malpighi, going back to Latin, "berry, grape, berry or grape seed," probably of pre-Latin substratal origin
First Known Use
circa 1751, in the meaning defined above
Medical Definition
acinus
noun
aci·nus ˈas-ə-nəs ə-ˈsī-
ə-ˈsī- plural acini -ˌnī
: any of the small sacs or alveoli that terminate the ducts of some exocrine glands and are lined with secretory cells