lactoglobulin
noun
lac·to·glob·u·lin ˌlak-tə-ˈglä-byə-lən 
: a crystalline protein fraction that is obtained from the whey of milk
Example Sentences
Recent Examples on the Web Using mass spectrometry analysis, the team identified peptides from the beta lactoglobulin protein in seven of these individuals’ calcified plaque. 
Meilan Solly, Smithsonian, 12 Sep. 2019
Meilan Solly, Smithsonian, 12 Sep. 2019 Word History
First Known Use
1885, in the meaning defined above
Medical Definition
lactoglobulin
noun
lac·to·glob·u·lin -ˈgläb-yə-lən
: a crystalline protein fraction that is obtained from the whey of milk