: a highly contagious viral disease of poultry that is marked especially by proliferation of lymphoid cells and is caused by a herpesvirus (Mardivirus gallidalpha2)
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“Marek's disease.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Marek%27s%20disease. Accessed 9 Nov. 2025.
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Marek's disease
noun
Mar·ek's disease
ˈmar-iks-, ˈmer- 
: a highly contagious viral disease of poultry that is characterized especially by proliferation of lymphoid cells and is caused by a herpesvirus (Mardivirus gallidalpha2)
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