Marek's disease
noun
Mar·ek's disease ˈmer-iks- 
: a highly contagious virus disease of poultry that is marked especially by proliferation of lymphoid cells and is caused by either of two herpesviruses (species Gallid herpesvirus 2 and Gallid herpesvirus 3 of the genus Mardivirus)
Word History
Etymology
József Marek †1952 Hungarian veterinarian
First Known Use
1947, in the meaning defined above
Medical Definition
Marek's disease
noun
Mar·ek's disease ˈmar-iks-, ˈmer-
: a highly contagious virus disease of poultry that is characterized especially by proliferation of lymphoid cells and is caused by either of two herpesviruses (species Gallid herpesvirus 2 and Gallid herpesvirus 3)