erythroleukosis
noun
eryth·ro·leu·ko·sis
variants:
or chiefly British erythroleucosis \ -lü-ˈkō-səs 
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plural erythroleukoses
or chiefly British erythroleucoses\ -ˌsēz
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Medical Definition of erythroleukosis
: a leukemic disease of poultry