lobule
noun
lob·ule ˈlä-(ˌ)byül 
: a small lobe
also : a subdivision of a lobe
Example Sentences
Recent Examples on the Web Cysts form when fluid collects at the spot where a lobule, which produces milk during lactation, meets a milk storage duct. 
Rebekah Kuschmider, Health.com, 14 Oct. 2021 In 2010, she was diagnosed with breast cancer again—this time with ductal carcinoma, like before, and lobular carcinoma, a cancer that affects the lobules that produce milk and empty out in the milk ducts. Maggie O'neill, Health.com, 4 Sep. 2019
Rebekah Kuschmider, Health.com, 14 Oct. 2021 In 2010, she was diagnosed with breast cancer again—this time with ductal carcinoma, like before, and lobular carcinoma, a cancer that affects the lobules that produce milk and empty out in the milk ducts. Maggie O'neill, Health.com, 4 Sep. 2019 Word History
First Known Use
1682, in the meaning defined above
Medical Definition
lobule
noun
lob·ule ˈläb-(ˌ)yü(ə)l
1
: a small lobe
the lobule of the ear
2
: a subdivision of a lobe
specifically : one of the small masses of tissue of which various organs (as the liver) are made up